I do not believe in any gods.
I do not believe in a creator god because I feel very strongly that such a theory self-destructs almost immediately:
In order to have created the vast complexity of the universe, a creator god would have to be immeasurably more complex than its creation. On one hand, creationists posit that the complexity of the universe cannot be eternal and that it could not have arisen from nothing as it is too complex. On the other hand, an immeasurably more complex creator god is eternal/uncreated. What is impossible on one hand is possible on the other, only to an immeasurably greater degree. This kind of incoherent, self-destructing logic makes it impossible for me to take the idea of a personal creator god seriously.