Do We Need The Quran To Believe In God?
No you don’t you can belive, but to find out who He is and what is your relation to Him prophets are sent and since no prophet will come anymore you have substitute in form of Quran that will guide till the end of time as prophet would’ve from getting to know him to what is required.
No. There’s nothing in the fitrah or any empirical evidence that there could be multiple creators. The idea of multiple creators is purely intellectual, and all intellectual ideas without any evidence are referred to as fiction.