One God
[21:21] Have they found gods on earth who can create?
[21:22] If there were in them (the heavens and the earth) other gods beside GOD, there would have been chaos. Glory be to GOD; the Lord with absolute authority. He is high above their claims.
[8:74] Those who believed and emigrated, and strove in the cause of GOD, as well as those who hosted them and gave them refuge, and supported them, these are the true believers. They have deserved forgiveness and a generous recompense.
Philosophical argument for one God (even without scripture just logic)
https://plato.stanford.edu/entries/monotheism/
To create an apple pie from scratch, first you need to create the universe.
The secular (atheist) scientist says to God…
“Hey, we scientists have figured out how to make life from dirt, just as described in that book of Yours, Genesis.
God: Oh yeah?
Scientist: Yep
God: Show Me.
Scientist: No problem!
So, the scientist started to gather some dirt, and just as he was about to start working with it, he was interrupted…
God: Hold it, stop!!
Scientist: What?
God: What are you doing?
Scientist: I’m gathering some dirt to generate life, just as described in Your book.
God: Get your own dirt…
Quran Talk Blog 