There is plenty of proof there is no creator, in that the building blocks for life are very well understood, the accident of our existence, the fact we know how the universe was originally created up to the millisecond, etc. All far more convincing evidence of no creator than the entirely faith-based assertion that a creator exists. None of this particularly difficult to understand.
Except, again, there is no evidence for a creator, none. We know life exists in the universe outside of earth and that the vastness of the universe makes it considerably likely there is life somewhere else in the universe, so the notion of aliens isn't as far-fetched as, say, your spaghetti monster creator in the clouds deciding to create the universe from thin air and then of course failing to answer who created this God in the clouds. To say I don't know is all fine and dandy, it's just that there's a difference in the magnitudes of "I don't know", and most informed people will say they don't know for sure but that the likelihood of a God having done it is, well, basically zero.
Irony at its finest.