I believe that those without faith can choose to be either atheist or Christian. Not all Christians really have faith ... from talking to self described Christians.
Ultimately though, I can't really choose my beliefs. I seem to be lead to them through thought processes, intuitions and so forth.
Currently I don't have any strong belief or faith. I have hope that this existence has a purpose, and that consciousness survives physical death. Whether there is an "Ultimate Consciousness" type of God separate from the rest, I highly doubt.
So I'm kind of an atheist, with a spiritual bent.
Since you (didn't) ask.