One God (21:21 – 21:22)

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/