Different ways of God recognition

Since Quran is light and guides human, it includes invitations that are acceptable and understandable for all persons. Content of Quran is expressed as rational reasons and examples. One of the most important invitations of Quran is matter of monotheism. Quran uses different ways in order to guide persons toward source and resurrection.
God states to the messenger of God (peace of Allah be upon him and his descendants)
قُلْ إِنَّنِي هَدَانِي رَبِّي إِلَىٰ صِرَاطٍ مُّسْتَقِيمٍ دِينًا قِيَمًا مِّلَّةَ إِبْرَاهِيمَ حَنِيفًا ۚ وَمَا كَانَ مِنَ الْمُشْرِكِينَ
Say: "Verily, my Lord hath guided me to a way that is straight,- a religion of right,- the path (trod) by Abraham the true in Faith, and he (certainly) joined not gods with Allah''.
Orders of Quran are on a straight path as Quran states
إِنِّي تَوَكَّلْتُ عَلَى اللَّهِ رَبِّي وَرَبِّكُم ۚ مَّا مِن دَابَّةٍ إِلَّا هُوَ آخِذٌ بِنَاصِيَتِهَا ۚ إِنَّ رَبِّي عَلَىٰ صِرَاطٍ مُّسْتَقِيمٍ
I put my trust in Allah, My Lord and your Lord! There is not a moving creature, but He hath grasp of its fore-lock. Verily, it is my Lord that is on a straight Path.
The prophet (peace of Allah be upon him and his descendants) moves in a straight path and invites human to follow this path as Quran states

وَالْقُرْآنِ الْحَكِيمِ
. By the Qur´an, full of Wisdom
إِنَّكَ لَمِنَ الْمُرْسَلِينَ
Thou art indeed one of the messengers.
عَلَىٰ صِرَاطٍ مُّسْتَقِيمٍ
On a Straight Way.
God states to the messenger of God (peace of Allah be upon him and his descendants)
قَالَ فَبِمَا أَغْوَيْتَنِي لَأَقْعُدَنَّ لَهُمْ صِرَاطَكَ الْمُسْتَقِيمَ
He said: "Because thou hast thrown me out of the way, lo! I will lie in wait for them on thy straight way.
Quran states straight path
قُلْ إِنَّنِي هَدَانِي رَبِّي إِلَىٰ صِرَاطٍ مُّسْتَقِيمٍ دِينًا قِيَمًا مِّلَّةَ إِبْرَاهِيمَ حَنِيفًا ۚ وَمَا كَانَ مِنَ الْمُشْرِكِينَ
Say: "Verily, my Lord hath guided me to a way that is straight,- a religion of right,- the path (trod) by Abraham the true in Faith, and he (certainly) joined not gods with Allah.
قُلْ إِنَّ صَلَاتِي وَنُسُكِي وَمَحْيَايَ وَمَمَاتِي لِلَّهِ رَبِّ الْعَالَمِينَ
Say: "Truly, my prayer and my service of sacrifice, my life and my death, are (all) for Allah, the Cherisher of the Worlds.
Quran states about angels of death
وَلَوْ تَرَىٰ إِذْ يَتَوَفَّى الَّذِينَ كَفَرُوا ۙ الْمَلَائِكَةُ يَضْرِبُونَ وُجُوهَهُمْ وَأَدْبَارَهُمْ وَذُوقُوا عَذَابَ الْحَرِيقِ
If thou couldst see, when the angels take the souls of the Unbelievers (at death), (How) they smite their faces and their backs, (saying): "Taste the penalty of the blazing Fire''.
The life and death of the prophet is for God;
لَا شَرِيكَ لَهُ ۖ وَبِذَٰلِكَ أُمِرْتُ وَأَنَا أَوَّلُ الْمُسْلِمِينَ
No partner hath He: this am I commanded, and I am the first of those who bow to His will.
Quran mentions three reasons for monotheism;
قُلْ أَغَيْرَ اللَّهِ أَبْغِي رَبًّا وَهُوَ رَبُّ كُلِّ شَيْءٍ ۚ وَلَا تَكْسِبُ كُلُّ نَفْسٍ إِلَّا عَلَيْهَا ۚ وَلَا تَزِرُ وَازِرَةٌ وِزْرَ أُخْرَىٰ ۚ ثُمَّ إِلَىٰ رَبِّكُم مَّرْجِعُكُمْ فَيُنَبِّئُكُم بِمَا كُنتُمْ فِيهِ تَخْتَلِفُونَ
Say: "Shall I seek for (my) Cherisher other than Allah, when He is the Cherisher of all things (that exist)? Every soul draws the meed of its acts on none but itself: no bearer of burdens can bear of burdens can bear the burden of another. Your goal in the end is towards Allah: He will tell you the truth of the things wherein ye disputed.
Quran states that rewarding and punishing are true;
كُلُّ نَفْسٍ بِمَا كَسَبَتْ رَهِينَةٌ
Every soul will be (held) in pledge for its deeds.
إِلَّا أَصْحَابَ الْيَمِينِ
Except the Companions of the Right Hand.
Monotheism refers to necessity of the resurrection and the doomsday
قُلْ أَغَيْرَ اللَّهِ أَبْغِي رَبًّا وَهُوَ رَبُّ كُلِّ شَيْءٍ ۚ وَلَا تَكْسِبُ كُلُّ نَفْسٍ إِلَّا عَلَيْهَا ۚ وَلَا تَزِرُ وَازِرَةٌ وِزْرَ أُخْرَىٰ ۚ ثُمَّ إِلَىٰ رَبِّكُم مَّرْجِعُكُمْ فَيُنَبِّئُكُم بِمَا كُنتُمْ فِيهِ تَخْتَلِفُونَ
Say: "Shall I seek for (my) Cherisher other than Allah, when He is the Cherisher of all things (that exist)? Every soul draws the meed of its acts on none but itself: no bearer of burdens can bear of burdens can bear the burden of another. Your goal in the end is towards Allah: He will tell you the truth of the things wherein ye disputed.
Some false groups exist until the doomsday as Quran states
وَقَالَتِ الْيَهُودُ يَدُ اللَّهِ مَغْلُولَةٌ ۚ غُلَّتْ أَيْدِيهِمْ وَلُعِنُوا بِمَا قَالُوا ۘ بَلْ يَدَاهُ مَبْسُوطَتَانِ يُنفِقُ كَيْفَ يَشَاءُ ۚ وَلَيَزِيدَنَّ كَثِيرًا مِّنْهُم مَّا أُنزِلَ إِلَيْكَ مِن رَّبِّكَ طُغْيَانًا وَكُفْرًا ۚ وَأَلْقَيْنَا بَيْنَهُمُ الْعَدَاوَةَ وَالْبَغْضَاءَ إِلَىٰ يَوْمِ الْقِيَامَةِ ۚ كُلَّمَا أَوْقَدُوا نَارًا لِّلْحَرْبِ أَطْفَأَهَا اللَّهُ ۚ وَيَسْعَوْنَ فِي الْأَرْضِ فَسَادًا ۚ وَاللَّهُ لَا يُحِبُّ الْمُفْسِدِينَ
The Jews say: "Allah´s hand is tied up." Be their hands tied up and be they accursed for the (blasphemy) they utter. Nay, both His hands are widely outstretched: He giveth and spendeth (of His bounty) as He pleaseth. But the revelation that cometh to thee from Allah increaseth in most of them their obstinate rebellion and blasphemy. Amongst them we have placed enmity and hatred till the Day of Judgment. Every time they kindle the fire of war, Allah doth extinguish it; but they (ever) strive to do mischief on earth. And Allah loveth not those who do mischief.
وَمِنَ الَّذِينَ قَالُوا إِنَّا نَصَارَىٰ أَخَذْنَا مِيثَاقَهُمْ فَنَسُوا حَظًّا مِّمَّا ذُكِّرُوا بِهِ فَأَغْرَيْنَا بَيْنَهُمُ الْعَدَاوَةَ وَالْبَغْضَاءَ إِلَىٰ يَوْمِ الْقِيَامَةِ ۚ وَسَوْفَ يُنَبِّئُهُمُ اللَّهُ بِمَا كَانُوا يَصْنَعُونَ
From those, too, who call themselves Christians, We did take a covenant, but they forgot a good part of the message that was sent them: so we estranged them, with enmity and hatred between the one and the other, to the day of judgment. And soon will Allah show them what it is they have done.
When disagreements end, reality will appear as Quran states
سَنُرِيهِمْ آيَاتِنَا فِي الْآفَاقِ وَفِي أَنفُسِهِمْ حَتَّىٰ يَتَبَيَّنَ لَهُمْ أَنَّهُ الْحَقُّ ۗ أَوَلَمْ يَكْفِ بِرَبِّكَ أَنَّهُ عَلَىٰ كُلِّ شَيْءٍ شَهِيدٌ
Soon will We show them our Signs in the (furthest) regions (of the earth), and in their own souls, until it becomes manifest to them that this is the Truth. Is it not enough that thy Lord doth witness all things.
Necessity of rewarding and punishing refer to creator as Quran states
وَهُوَ الَّذِي جَعَلَكُمْ خَلَائِفَ الْأَرْضِ وَرَفَعَ بَعْضَكُمْ فَوْقَ بَعْضٍ دَرَجَاتٍ لِّيَبْلُوَكُمْ فِي مَا آتَاكُمْ ۗ إِنَّ رَبَّكَ سَرِيعُ الْعِقَابِ وَإِنَّهُ لَغَفُورٌ رَّحِيمٌ
It is He Who hath made you (His) agents, inheritors of the earth: He hath raised you in ranks, some above others: that He may try you in the gifts He hath given you: for thy Lord is quick in punishment: yet He is indeed Oft-forgiving, Most Merciful.
There are different positions so that the system of the society can be provided as Quran states
أَهُمْ يَقْسِمُونَ رَحْمَتَ رَبِّكَ ۚ نَحْنُ قَسَمْنَا بَيْنَهُم مَّعِيشَتَهُمْ فِي الْحَيَاةِ الدُّنْيَا ۚ وَرَفَعْنَا بَعْضَهُمْ فَوْقَ بَعْضٍ دَرَجَاتٍ لِّيَتَّخِذَ بَعْضُهُم بَعْضًا سُخْرِيًّا ۗ وَرَحْمَتُ رَبِّكَ خَيْرٌ مِّمَّا يَجْمَعُونَ
Is it they who would portion out the Mercy of thy Lord? It is We Who portion out between them their livelihood in the life of this world: and We raise some of them above others in ranks, so that some may command work from others. But the Mercy of thy Lord is better than the (wealth) which they amass.
God is immaculate of description of foreigners as Quran states
سُبْحَانَ رَبِّكَ رَبِّ الْعِزَّةِ عَمَّا يَصِفُونَ
Glory to thy Lord, the Lord of Honour and Power! (He is free) from what they ascribe (to Him).
ذَٰلِكَ بِأَنَّ اللَّهَ هُوَ الْحَقُّ وَأَنَّ مَا يَدْعُونَ مِن دُونِهِ هُوَ الْبَاطِلُ وَأَنَّ اللَّهَ هُوَ الْعَلِيُّ الْكَبِيرُ
That is because Allah - He is the Reality; and those besides Him whom they invoke,- they are but vain Falsehood: verily Allah is He, Most High, Most Great.
Whatever is true in the world is from God;
الْحَقُّ مِن رَّبِّكَ ۖ فَلَا تَكُونَنَّ مِنَ الْمُمْتَرِينَ
.The Truth is from thy Lord; so be not at all in doubt
Quran states
وَمَا خَلَقْنَا السَّمَاءَ وَالْأَرْضَ وَمَا بَيْنَهُمَا بَاطِلًا ۚ ذَٰلِكَ ظَنُّ الَّذِينَ كَفَرُوا ۚ فَوَيْلٌ لِّلَّذِينَ كَفَرُوا مِنَ النَّارِ
Not without purpose did We create heaven and earth and all between! that were the thought of Unbelievers! but woe to the Unbelievers because of the Fire (of Hell.
Quran states about the doomsday
يَسْأَلُونَكَ عَنِ السَّاعَةِ أَيَّانَ مُرْسَاهَا
They ask thee about the Hour,-´When will be its appointed time.
Quran states about persons that deny the doomsday
وَمَا خَلَقْنَا السَّمَاءَ وَالْأَرْضَ وَمَا بَيْنَهُمَا بَاطِلًا ۚ ذَٰلِكَ ظَنُّ الَّذِينَ كَفَرُوا ۚ فَوَيْلٌ لِّلَّذِينَ كَفَرُوا مِنَ النَّارِ
Not without purpose did We create heaven and earth and all between! that were the thought of Unbelievers! but woe to the Unbelievers because of the Fire (of Hell).
Quran states
أَوْحَيْنَا إِلَيْهِ أَنِ اصْنَعِ الْفُلْكَ بِأَعْيُنِنَا وَوَحْيِنَا فَإِذَا جَاءَ أَمْرُنَا وَفَارَ التَّنُّورُ ۙ فَاسْلُكْ فِيهَا مِن كُلٍّ زَوْجَيْنِ اثْنَيْنِ وَأَهْلَكَ إِلَّا مَن سَبَقَ عَلَيْهِ الْقَوْلُ مِنْهُمْ ۖ وَلَا تُخَاطِبْنِي فِي الَّذِينَ ظَلَمُوا ۖ إِنَّهُم مُّغْرَقُونَ
So We inspired him (with this message): "Construct the Ark within Our sight and under Our guidance: then when comes Our Command, and the fountains of the earth gush forth, take thou on board pairs of every species, male and female, and thy family- except those of them against whom the Word has already gone forth: And address Me not in favour of the wrong-doers; for they shall be drowned (in the Flood).
Quran states in the doomsday
وَامْتَازُوا الْيَوْمَ أَيُّهَا الْمُجْرِمُونَ
And O ye in sin! Get ye apart this Day.
أَمْ نَجْعَلُ الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ كَالْمُفْسِدِينَ فِي الْأَرْضِ أَمْ نَجْعَلُ الْمُتَّقِينَ كَالْفُجَّارِ
Shall We treat those who believe and work deeds of righteousness, the same as those who do mischief on earth? Shall We treat those who guard against evil, the same as those who turn aside from the right.
Quran states about reasons of the resurrection
قُل لِّمَن مَّا فِي السَّمَاوَاتِ وَالْأَرْضِ ۖ قُل لِّلَّهِ ۚ كَتَبَ عَلَىٰ نَفْسِهِ الرَّحْمَةَ ۚ لَيَجْمَعَنَّكُمْ إِلَىٰ يَوْمِ الْقِيَامَةِ لَا رَيْبَ فِيهِ ۚ الَّذِينَ خَسِرُوا أَنفُسَهُمْ فَهُمْ لَا يُؤْمِنُونَ
Say: "To whom belongeth all that is in the heavens and on earth?" Say: "To Allah. He hath inscribed for Himself (the rule of) Mercy. That He will gather you together for the Day of Judgment, there is no doubt whatever. It is they who have lost their own souls, that will not believe.
وَذَرِ الَّذِينَ اتَّخَذُوا دِينَهُمْ لَعِبًا وَلَهْوًا وَغَرَّتْهُمُ الْحَيَاةُ الدُّنْيَا ۚ وَذَكِّرْ بِهِ أَن تُبْسَلَ نَفْسٌ بِمَا كَسَبَتْ لَيْسَ لَهَا مِن دُونِ اللَّهِ وَلِيٌّ وَلَا شَفِيعٌ وَإِن تَعْدِلْ كُلَّ عَدْلٍ لَّا يُؤْخَذْ مِنْهَا ۗ أُولَٰئِكَ الَّذِينَ أُبْسِلُوا بِمَا كَسَبُوا ۖ لَهُمْ شَرَابٌ مِّنْ حَمِيمٍ وَعَذَابٌ أَلِيمٌ بِمَا كَانُوا يَكْفُرُونَ
Leave alone those who take their religion to be mere play and amusement, and are deceived by the life of this world. But proclaim (to them) this (truth): that every soul delivers itself to ruin by its own acts: it will find for itself no protector or intercessor except Allah: if it offered every ransom, (or reparation), none will be accepted: such is (the end of) those who deliver themselves to ruin by their own acts: they will have for drink (only) boiling water, and for punishmen.
وَهُوَ الَّذِي أَنشَأَ جَنَّاتٍ مَّعْرُوشَاتٍ وَغَيْرَ مَعْرُوشَاتٍ وَالنَّخْلَ وَالزَّرْعَ مُخْتَلِفًا أُكُلُهُ وَالزَّيْتُونَ وَالرُّمَّانَ مُتَشَابِهًا وَغَيْرَ مُتَشَابِهٍ ۚ كُلُوا مِن ثَمَرِهِ إِذَا أَثْمَرَ وَآتُوا حَقَّهُ يَوْمَ حَصَادِهِ ۖ وَلَا تُسْرِفُوا ۚ إِنَّهُ لَا يُحِبُّ الْمُسْرِفِينَ
It is He Who produceth gardens, with trellises and without, and dates, and tilth with produce of all kinds, and olives and pomegranates, similar (in kind) and different (in variety): eat of their fruit in their season, but render the dues that are proper on the day that the harvest is gathered. But waste not by excess: for Allah loveth not the wasters.
فَإِن كَذَّبُوكَ فَقُل رَّبُّكُمْ ذُو رَحْمَةٍ وَاسِعَةٍ وَلَا يُرَدُّ بَأْسُهُ عَنِ الْقَوْمِ الْمُجْرِمِينَ
If they accuse thee of falsehood, say: "Your Lord is full of mercy all-embracing; but from people in guilt never will His wrath be turned back.