AV,
I have a graduate degree in a science related field and believed for a good 20 years after earning that degree, so defending the belief in regards to science had zero to do with not believing in Christianity any longer.
Looking deep into the bible though (specifically the NT), was what started the ball rolling and then taking another look at the claims of Christianity and the definition of the Christian God and comparing that to the realities of the world. They couldn't be reconciled any further for me and I don't play pretend belief games with myself.
And, I am here for intellectual conversation, entertainment and observing the psychology involved in the posters on this board, which I find highly intriguing.