The question—“If god is a necessary being that means he never began to exist, then asking who created god must be the most stupid question, then why do atheists keep asking that, don't they have any logical way of disproving god?”

But if God is not a necessary being, the conclusion the question suggests is false.

The error in questions such as this one is to think that—

If A, then B, is a proof of B.

“Don’t they have any logical way of disproving God?” Yes—

Definition. The universe is all being.

Conclusion. (Therefore) there is no being other than the universe.

Definition. A creator of a being is another being (that causes the created being to come into existence).

Conclusion. (Therefore) the universe has no creator (since the universe has no other being).

Definition. God is the creator of the universe.

Conclusion. (Therefore) God does not exist.