“They say: “Become Jews or Christians if ye would be guided (to salvation).” Say thou: “Nay! (I would rather) the Religion of Abraham, the True, and he joined not gods with Allah.”

[Quran 2:135]

“Abraham was not a Jew nor yet a Christian; but he was true in Faith, and bowed his will to Allah’s (which is Islam), and he joined not gods with Allah.”

[Quran Ali Imran:67]

God does not forgive the sin of joining other gods with Him:

“Allah forgiveth not (the sin of) joining other gods with Him; but He forgiveth whom He pleaseth other sins than this: one who joins other gods with Allah, hath, strayed far, far away (from the Right).”

[Quran An Nisaa:115]

“Allah has said: “Take not (for worship) two gods: for He is just One God: then fear Me (and Me alone).”

[Quran An Nahl:51]

“Say: if there had been (other) gods with Him, – as they say – behold, they would certainly have sought out a way to the Lord of the Throne!”

[Quran Al Isra:42]

“If there were, in the heavens and the earth, other gods besides Allah, there would have been confusion in both! But glory to Allah, the Lord of the Throne: (High is He) above what they attribute to Him!”

[Quran Al Anbiyaa:22]

“No son did Allah beget, nor is there any god along with Him: (if there were many gods), behold, each god would have taken away what he had created, and some would have Lorded it over others! Glory to Allah! (He is free) from the (sort of) things they attribute to Him!”

[Quran Al Mu’minuun:91]

Just like quoted in the Quran:

“Say: He is Allah, the One and Only;

Allah, the Eternal, Absolute;

He begetteth not, nor is He begotten;

And there is none like unto Him.”

[Quran 112:1-4]

God is the creator of all. So it is impossible that a God born after His creatures:

“Praise be to Allah, Who created the heavens and the earth, and made the Darkness and the Light. Yet those who reject Faith hold (others) as equal with their Guardian-Lord.”

[Quran 6:1]

God knows everything, sees everything:

“With Him are the keys of the Unseen, the treasures that none knoweth but He. He knoweth whatever there is on the earth and in the sea. Not a leaf doth fall but with His knowledge: there is not a grain in the darkness (or depths) of the earth, nor anything fresh or dry (green or withered), but is (inscribed) in a Record clear (to those who can read).”

[Quran Al An’am:59}

Do not worship God that has to be fed or eat:

"Say: "Shall I take for my protector any other than Allah, the Maker of the heavens and the earth? And He it is that feedeth but is not fed." Say: "Nay! but I am commanded to be the first of those who bow to Allah (in Islam), and be not thou of the company of those who join gods with Allah."

[Quran 6:14]