I know that many left because of a lack of real love or for other personal reasons. I would never belittle those reasons for exiting, they are as valid as any other, but if that describes your situation then perhaps this topic might not apply so much to you.
I left the Watchtower because I came to realise the doctrine was flawed. I was in my mid 30's before my mind begin waking up and I started to develop basic critical thinking abilities. I hung on to god for several years after I left dubdom (check my topic history) but sure enough the curiosity and hunger for knowledge that had propelled me out of a religious cult inevitably led me out of religion altogether.
Folks have said to me that it's a shame I "threw the baby out with the bath water". I don't see it like that. A baby is precious, my faith in the Watchtower/God/Jesus . . . . well I don't want to be deliberately rude but I can only equate them with refuse that needed throwing out of my life.
So how about you? How come you've left one form of christianity but not walked all the way out of the door marked 'Faith'?