It answers the big question of beginnings, which atheism cannot answer.
Theism answers the cause for the effect. Atheism does not. For atheism, there was either no cause, or this universe is one of an infinite number, and thus is able to avoid confronting any beginning cause, or what happened before the beginning.
Just another gentle reminder for our readers. Atheism is only a position in the disbelief in the claims ('there are gods') made by theists. It has no position on how the universe came to be. Subtle distinction but an important one. Atheism doesn't answer questions, it does the questioning.