I'm still absolutely Christian in the sense of "Do to others as you would have them do to you" but it's not a requirement to belong to a secular denomination to do that. I don't understand why people feel they have to go to some meeting or building on a regular basis to remind them that they're supposed to be nice to each other. Just do the right thing! You already know how God want's you to act.
I hope I try and act like that anyway - nothing to do with God.