When does someone quit christianity?

I was raised catholic ..mistakenly become adventist ..trying to get back to catholicism ..I failed , ...I think I have stopped believing in religions, ...I got sick of them ....I want to live a spiritual but not religious life ...but, yet , have stopped being a member of christianity for that ..? and does a spiritual life means that you have to be stuck only on spiritual christianity, or can it larger than that ..mystical, astrology, wicca and so on ..including spiritual christianity ..?