And what created the creator that created god?... and what created the creator that created the creator that created god?............ oh, my.
This is probably the question that started me on the road to atheism.
Yeah, it kind of simultaneously defeats the two "strongest" (not saying much) arguments in philosophy for God's existence, the cosmological and teleological arguments.
The former is that all things need a cause, but then magically there can be a first cause that wasn't itself caused, even though that directly contradicts the first assumption.
The latter is the argument from design which is really just a variant of the former, adding complexity to the mix, namely that all complexity must have been caused by something that had such complexity as a goal (and thus had a mind). But since such a mind is inherently complex, that mind would need a mind to have created it, ad infinitum.
At age 17, I took my first Philosophy course, I was exposed to these and the other 2 main arguments for God (ontological: There must be the greatest thing imaginable and whatever that is, its God; and Moral Law: Morals laws wouldn't exist without a law-maker). I wrote my thesis for the class on how pathetically bad and self-defeating all these were. Since they were presented as the best intellectual arguments anyone has come up with so far (and sadly they are), that sealed the deal for me in being an atheist. I had already started down that road at age 13, but that start was more about rejecting any notion of a God that was powerful and good, due to how almost every fact of the world contradicted these assumptions. I left a little room for a possible deistic creator God, up until that Philosophy course.