If you go with an explanation that tries to argue in favor of the Big Bang, then the question remains, where did that energy come from? In physics, there has never been a documented case of something appearing from nothing. No matter how far back you go, there has to be a point of creation somewhere.
The point is, that we don't have the answers. Many cultures and peoples have tried to figure this out and came up with their own theories, but it's all still very much unexplained. A belief in a creator isn't the craziest thing.