The truth is. You don't have to prove something exists in this world. You have to prove it doesn't exist. Because the absense of proof doesn't mean that something doesn't exist. The only thing that proves something doesn't exist is proof that something doesn't exist.
The only real question is what counts as proof?
For all three of the Abrahamic religions have a literal account of the creation of the earth and humans yet there is plenty of proof that this did not occur. I'm sure such proofs exist for other religions such as Taoism and Hinduism.
The idea of a God that started the big bang and left it at that cannot be proven or disproven however taking the common meaning of Occam's Razor the simplest solution is most likely to be correct and as an omnipotent being is infinitely complex by definition it is therefore unlikely to exist.
