Why Just One Creator?
If someone makes such a claim then they will have to bring forth evidence of it. Knowledge – at least in the realm of religion – can’t be based on hypothetical ideas. To the point that Taha made above based on Quran ayah 21:22 is also very valid. If there were multiple entities that were so powerful, then there surely would be signs of distress, unrest, and turmoil in the laws of nature and the universe in general. The calmness and harmony of the nature and the universe, however, point towards a single Creator. To sum it up, from everything we know we can only infer a single Creator. If someone claims more, then the burden of proof lies upon them.
God is not presenting any hypothetical claim. What’s stated in 21:2 is an argument to the claim that there’s only one Creator. The claim itself is substantiated by our fitra, then reinforced by our experience, and then further verified by messengers and scriptures of God. Is your fitra telling you that there are multiple Creators? Has majority of humanity’s fitra concluded that there are multiple Creators? Is there any part of the universe we see that looks out of the ordinary and evidently created by a different entity? Can we present any divine scriptures where God has given us any information about His partners? The response to all these questions is a resounding no. The only argument you’re presenting is that since the universe is so complex, there are multiple creators. That’s imagination, because it has no sound evidence. It will become worthy of investigation when you present any evidence for the argument.
Why does fitrah only allow one creator- the majority of history is polytheistic
Why does a creator have to be all knowledgeable? Why does a creator have to be God?
That is correct, without communication from God back to earth there’s only empirical evidence, but nothing conclusive.