Ranks of monotheism from point of view of Quran and Ahle Beit

Monotheism means that we consider only exalted God as the creator of the world and deny existence of several Gods. Monotheism is the first invitation of all prophets. Monotheism is the nature of all aware persons. Monotheism is the basis of the Islam and is the half of the religion. It is the best devotion and eradicates corruptions in the sky and on the earth.
During the history, one of important purposes of prophets was to invite human toward monotheism, God worshipping and to prevent persons from polytheism and idol worshipping.
Introduction
Monotheism means that we consider only a God in beliefs and worshipping God.
Monotheism is one of the most basic matters of Quran that a lot of scientists have talked about it and have referred to its kinds.
There is no question that monotheism is one of the principles of the religion and all of persons know that the principles of the religion are considered as religious beliefs.
Meaning of God unity
Only exalted God has no boundary and no beginning and ending because the existence of exalted God is absolute and does not depend on any condition.
It is clear that nature of persons is not active equally, but it may be influenced by social and environmental factors.
Some scientist have divided monotheism into four ranks: monotheism in nature, monotheism in attributes, monotheism in actions and monotheism in devotion.

Quran states
فَأَقِمْ وَجْهَكَ لِلدِّينِ حَنِيفًا ۚ فِطْرَتَ اللَّهِ الَّتِي فَطَرَ النَّاسَ عَلَيْهَا ۚ لَا تَبْدِيلَ لِخَلْقِ اللَّهِ ۚ ذَٰلِكَ الدِّينُ الْقَيِّمُ وَلَٰكِنَّ أَكْثَرَ
النَّاسِ لَا يَعْلَمُونَ
So set thou thy face steadily and truly to the Faith: (establish) Allah´s handiwork according to the pattern on which He has made mankind: no change (let there be) in the work (wrought) by Allah: that is the standard Religion: but most among mankind understand not.
Quran states that no one is similar to God;
فَاطِرُ السَّمَاوَاتِ وَالْأَرْضِ ۚ جَعَلَ لَكُم مِّنْ أَنفُسِكُمْ أَزْوَاجًا وَمِنَ الْأَنْعَامِ أَزْوَاجًا ۖ يَذْرَؤُكُمْ فِيهِ ۚ لَيْسَ كَمِثْلِهِ شَيْءٌ ۖ وَهُوَ السَّمِيعُ الْبَصِيرُ
(He is) the Creator of the heavens and the earth: He has made for you pairs from among yourselves, and pairs among cattle: by this means does He multiply you: there is nothing whatever like unto Him, and He is the One that hears and sees (all things).
Quran states
اللَّهُ نُورُ السَّمَاوَاتِ وَالْأَرْضِ ۚ مَثَلُ نُورِهِ كَمِشْكَاةٍ فِيهَا مِصْبَاحٌ ۖ الْمِصْبَاحُ فِي زُجَاجَةٍ ۖ الزُّجَاجَةُ كَأَنَّهَا كَوْكَبٌ دُرِّيٌّ يُوقَدُ مِن شَجَرَةٍ مُّبَارَكَةٍ زَيْتُونَةٍ لَّا شَرْقِيَّةٍ وَلَا غَرْبِيَّةٍ يَكَادُ زَيْتُهَا يُضِيءُ وَلَوْ لَمْ تَمْسَسْهُ نَارٌ ۚ نُّورٌ عَلَىٰ نُورٍ ۗ يَهْدِي اللَّهُ لِنُورِهِ مَن يَشَاءُ ۚ وَيَضْرِبُ اللَّهُ الْأَمْثَالَ لِلنَّاسِ ۗ وَاللَّهُ بِكُلِّ شَيْءٍ عَلِيمٌ
Allah is the Light of the heavens and the earth. The Parable of His Light is as if there were a Niche and within it a Lamp: the Lamp enclosed in Glass: the glass as it were a brilliant star: Lit from a blessed Tree, an Olive, neither of the east nor of the west, whose oil is well-nigh luminous, though fire scarce touched it: Light upon Light! Allah doth guide whom He will to His Light: Allah doth set forth Parables for men: and Allah doth know all things.
لِلَّذِينَ لَا يُؤْمِنُونَ بِالْآخِرَةِ مَثَلُ السَّوْءِ ۖ وَلِلَّهِ الْمَثَلُ الْأَعْلَىٰ ۚ وَهُوَ الْعَزِيزُ الْحَكِيمُ
To those who believe not in the Hereafter, applies the similitude of evil: to Allah applies the highest similitude: for He is the Exalted in Power, full of Wisdom.
Monotheism in attributes means that attributes of God are like his nature.
Monotheism in actions means that each movement and each action come back to nature of exalted God.
Quran states
وَرَسُولًا إِلَىٰ بَنِي إِسْرَائِيلَ أَنِّي قَدْ جِئْتُكُم بِآيَةٍ مِّن رَّبِّكُمْ ۖ أَنِّي أَخْلُقُ لَكُم مِّنَ الطِّينِ كَهَيْئَةِ الطَّيْرِ فَأَنفُخُ فِيهِ فَيَكُونُ طَيْرًا بِإِذْنِ اللَّهِ ۖ وَأُبْرِئُ الْأَكْمَهَ وَالْأَبْرَصَ وَأُحْيِي الْمَوْتَىٰ بِإِذْنِ اللَّهِ ۖ وَأُنَبِّئُكُم بِمَا تَأْكُلُونَ وَمَا تَدَّخِرُونَ فِي بُيُوتِكُمْ ۚ إِنَّ فِي ذَٰلِكَ لَآيَةً لَّكُمْ إِن كُنتُم مُّؤْمِنِينَ
And (appoint him) a messenger to the Children of Israel, (with this message): "´I have come to you, with a Sign from your Lord, in that I make for you out of clay, as it were, the figure of a bird, and breathe into it, and it becomes a bird by Allah´s leave: And I heal those born blind, and the lepers, and I quicken the dead, by Allah´s leave; and I declare to you what ye eat, and what ye store in your houses. Surely therein is a Sign for you if ye did believe.
يَا أَيُّهَا الَّذِينَ آمَنُوا اتَّقُوا اللَّهَ وَابْتَغُوا إِلَيْهِ الْوَسِيلَةَ وَجَاهِدُوا فِي سَبِيلِهِ لَعَلَّكُمْ تُفْلِحُونَ
O ye who believe! Do your duty to Allah, seek the means of approach unto Him, and strive with might and main in his cause: that ye may prosper.
Comprehensiveness and permanence of Quran are the exclusive features of the remarks of God.
Quran states
وَمَا أَرْسَلْنَا مِن رَّسُولٍ إِلَّا لِيُطَاعَ بِإِذْنِ اللَّهِ ۚ وَلَوْ أَنَّهُمْ إِذ ظَّلَمُوا أَنفُسَهُمْ جَاءُوكَ فَاسْتَغْفَرُوا اللَّهَ وَاسْتَغْفَرَ لَهُمُ الرَّسُولُ لَوَجَدُوا اللَّهَ تَوَّابًا رَّحِيمًا
We sent not a messenger, but to be obeyed, in accordance with the will of Allah. If they had only, when they were unjust to themselves, come unto thee and asked Allah´s forgiveness, and the Messenger had asked forgiveness for them, they would have found Allah indeed Oft-returning, Most Merciful.
The brothers of Hazrat Yusef (peace be upon him) said to their father
قَالُوا يَا أَبَانَا اسْتَغْفِرْ لَنَا ذُنُوبَنَا إِنَّا كُنَّا خَاطِئِينَ
They said: "O our father! ask for us forgiveness for our sins, for we were truly at fault''.
Quran states
قَالَ سَوْفَ أَسْتَغْفِرُ لَكُمْ رَبِّي ۖ إِنَّهُ هُوَ الْغَفُورُ الرَّحِيمُ
He said: "Soon will I ask my Lord for forgiveness for you: for he is indeed Oft-Forgiving, Most Merciful''.

يَا أَيُّهَا الَّذِينَ آمَنُوا اتَّقُوا اللَّهَ وَابْتَغُوا إِلَيْهِ الْوَسِيلَةَ وَجَاهِدُوا فِي سَبِيلِهِ لَعَلَّكُمْ تُفْلِحُونَ
O ye who believe! Do your duty to Allah, seek the means of approach unto Him, and strive with might and main in his cause: that ye may prosper.
مَالِكِ يَوْمِ الدِّينِ
.Master of the Day of Judgment
Monotheism in devotion means that persons should worship only exalted God because devotion should devote only a person that is absolute perfection, bestows all of blessings and is creator of all creatures.
Quran states
قُلِ اللَّهُمَّ مَالِكَ الْمُلْكِ تُؤْتِي الْمُلْكَ مَن تَشَاءُ وَتَنزِعُ الْمُلْكَ مِمَّن تَشَاءُ وَتُعِزُّ مَن تَشَاءُ وَتُذِلُّ مَن تَشَاءُ ۖ بِيَدِكَ الْخَيْرُ ۖ إِنَّكَ عَلَىٰ كُلِّ شَيْءٍ قَدِيرٌ
Say: "O Allah! Lord of Power (And Rule), Thou givest power to whom Thou pleasest, and Thou strippest off power from whom Thou pleasest: Thou enduest with honour whom Thou pleasest, and Thou bringest low whom Thou pleasest: In Thy hand is all good. Verily, over all things Thou hast power.
رَبِّ قَدْ آتَيْتَنِي مِنَ الْمُلْكِ وَعَلَّمْتَنِي مِن تَأْوِيلِ الْأَحَادِيثِ ۚ فَاطِرَ السَّمَاوَاتِ وَالْأَرْضِ أَنتَ وَلِيِّي فِي الدُّنْيَا وَالْآخِرَةِ ۖ تَوَفَّنِي مُسْلِمًا وَأَلْحِقْنِي بِالصَّالِحِينَ
O my Lord! Thou hast indeed bestowed on me some power, and taught me something of the interpretation of dreams and events,- O Thou Creator of the heavens and the earth! Thou art my Protector in this world and in the Hereafter. Take Thou my soul (at death) as one submitting to Thy will (as a Muslim), and unite me with the righteous''.
Monotheism in guardianship means that guardianship of all creatures is done by God and whoever is chosen by God is guardian of creatures.
The following verses refer to the guardianship of God, messenger of God and believers;
إِنَّ وَلِيِّيَ اللَّهُ الَّذِي نَزَّلَ الْكِتَابَ ۖ وَهُوَ يَتَوَلَّى الصَّالِحِينَ
For my Protector is Allah, Who revealed the Book (from time to time), and He will choose and befriend the righteous.
إِنَّمَا وَلِيُّكُمُ اللَّهُ وَرَسُولُهُ وَالَّذِينَ آمَنُوا الَّذِينَ يُقِيمُونَ الصَّلَاةَ وَيُؤْتُونَ الزَّكَاةَ وَهُمْ رَاكِعُونَ
Your (real) friends are (no less than) Allah, His Messenger, and the (fellowship of) believers,- those who establish regular prayers and regular charity, and they bow down humbly (in worship).
أَلَمْ تَعْلَمْ أَنَّ اللَّهَ لَهُ مُلْكُ السَّمَاوَاتِ وَالْأَرْضِ ۗ وَمَا لَكُم مِّن دُونِ اللَّهِ مِن وَلِيٍّ وَلَا نَصِيرٍ
Knowest thou not that to Allah belongeth the dominion of the heavens and the earth? And besides Him ye have neither patron nor helper.
اللَّهُ الَّذِي خَلَقَ السَّمَاوَاتِ وَالْأَرْضَ وَمَا بَيْنَهُمَا فِي سِتَّةِ أَيَّامٍ ثُمَّ اسْتَوَىٰ عَلَى الْعَرْشِ ۖ مَا لَكُم مِّن دُونِهِ مِن وَلِيٍّ وَلَا شَفِيعٍ ۚ أَفَلَا تَتَذَكَّرُونَ
It is Allah Who has created the heavens and the earth, and all between them, in six Days, and is firmly established on the Throne (of Authority): ye have none, besides Him, to protect or intercede (for you): will ye not then receive admonition?
وَإِن تَوَلَّوْا فَاعْلَمُوا أَنَّ اللَّهَ مَوْلَاكُمْ ۚ نِعْمَ الْمَوْلَىٰ وَنِعْمَ النَّصِيرُ
If they refuse, be sure that Allah is your Protector - the best to protect and the best to help.
وَكَذَٰلِكَ أَنزَلْنَاهُ حُكْمًا عَرَبِيًّا ۚ وَلَئِنِ اتَّبَعْتَ أَهْوَاءَهُم بَعْدَمَا جَاءَكَ مِنَ الْعِلْمِ مَا لَكَ مِنَ اللَّهِ مِن وَلِيٍّ وَلَا وَاقٍ
Thus have We revealed it to be a judgment of authority in Arabic. Wert thou to follow their (vain) desires after the knowledge which hath reached thee, then wouldst thou find neither protector nor defender against Allah.
أَمِ اتَّخَذُوا مِن دُونِهِ أَوْلِيَاءَ ۖ فَاللَّهُ هُوَ الْوَلِيُّ وَهُوَ يُحْيِي الْمَوْتَىٰ وَهُوَ عَلَىٰ كُلِّ شَيْءٍ قَدِيرٌ
What! Have they taken (for worship) protectors besides Him? But it is Allah,- He is the Protector, and it is He Who gives life to the dead: It is He Who has power over all things.
وَرَسُولًا إِلَىٰ بَنِي إِسْرَائِيلَ أَنِّي قَدْ جِئْتُكُم بِآيَةٍ مِّن رَّبِّكُمْ ۖ أَنِّي أَخْلُقُ لَكُم مِّنَ الطِّينِ كَهَيْئَةِ الطَّيْرِ فَأَنفُخُ فِيهِ فَيَكُونُ طَيْرًا بِإِذْنِ اللَّهِ ۖ وَأُبْرِئُ الْأَكْمَهَ وَالْأَبْرَصَ وَأُحْيِي الْمَوْتَىٰ بِإِذْنِ اللَّهِ ۖ وَأُنَبِّئُكُم بِمَا تَأْكُلُونَ وَمَا تَدَّخِرُونَ فِي بُيُوتِكُمْ ۚ إِنَّ فِي ذَٰلِكَ لَآيَةً لَّكُمْ إِن كُنتُم مُّؤْمِنِينَ
And (appoint him) a messenger to the Children of Israel, (with this message): "´I have come to you, with a Sign from your Lord, in that I make for you out of clay, as it were, the figure of a bird, and breathe into it, and it becomes a bird by Allah´s leave: And I heal those born blind, and the lepers, and I quicken the dead, by Allah´s leave; and I declare to you what ye eat, and what ye store in your houses. Surely therein is a Sign for you if ye did believe.
ذَٰلِكَ الَّذِي يُبَشِّرُ اللَّهُ عِبَادَهُ الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ ۗ قُل لَّا أَسْأَلُكُمْ عَلَيْهِ أَجْرًا إِلَّا الْمَوَدَّةَ فِي الْقُرْبَىٰ ۗ وَمَن يَقْتَرِفْ حَسَنَةً نَّزِدْ لَهُ فِيهَا حُسْنًا ۚ إِنَّ اللَّهَ غَفُورٌ شَكُورٌ
That is (the Bounty) whereof Allah gives Glad Tidings to His Servants who believe and do righteous deeds. Say: "No reward do I ask of you for this except the love of those near of kin." And if any one earns any good, We shall give him an increase of good in respect thereof: for Allah is Oft-Forgiving, Most Ready to appreciate (service).
قُلْ مَن رَّبُّ السَّمَاوَاتِ وَالْأَرْضِ قُلِ اللَّهُ ۚ قُلْ أَفَاتَّخَذْتُم مِّن دُونِهِ أَوْلِيَاءَ لَا يَمْلِكُونَ لِأَنفُسِهِمْ نَفْعًا وَلَا ضَرًّا ۚ قُلْ هَلْ يَسْتَوِي الْأَعْمَىٰ وَالْبَصِيرُ أَمْ هَلْ تَسْتَوِي الظُّلُمَاتُ وَالنُّورُ ۗ أَمْ جَعَلُوا لِلَّهِ شُرَكَاءَ خَلَقُوا كَخَلْقِهِ فَتَشَابَهَ الْخَلْقُ عَلَيْهِمْ ۚ قُلِ اللَّهُ خَالِقُ كُلِّ شَيْءٍ وَهُوَ الْوَاحِدُ الْقَهَّارُ (16) Say: "Who is the Lord and Sustainer of the heavens and the earth?" Say: "(It is) Allah." Say: "Do ye then take (for worship) protectors other than Him, such as have no power either for good or for harm to themselves?" Say: "Are the blind equal with those who see? Or the depths of darkness equal with light?" Or do they assign to Allah partners who have created (anything) as He has created, so that the creation seemed to them similar? Say: "Allah is the Creator of all things: He is the One, the Supreme and Irresistible.