I'm an atheist, not because of a rejection of a deity or of religion, but because I don't believe in a higher power and never have, despite having received a religious upbringing. I never had faith, but I always had logic.
I choose to embrace a different faith and take the position that creation logically implies a creator. We live in a universe that demonstrates cause and effect and this alone strongly supports belief in God over a creation of random happenstance.
I don't pretend to know how the universe started, if there was even a start. This is a very difficult scientific problem, experimentation is not very useful, at least not with our current capabilities. I don't see any logical way to go from there to the existence of a god. In fact, the existence of a god doesn't even solve the problem, because the question simply becomes, how did that god start/appear/was created ?