I no longer call myself a Catholic. That was not as hard as I thought it would be.
I have little trouble referring to myself as an Episcopalian. But the thing is that that really is not my "culture". I am not tied to the Episcopal Church... although I have a found a comfortable home at one of its churches. It is the particular Episcopal community to which I belong that makes sense to me. So I'll say I'm Episcopalian, but it doesn't mean all that much to me.
I don't come from the tradition of calling myself a Christian. Catholics tend to call themselves "Catholic", not so much "Christian". Also I'm not so big on the whole Christology stuff, and there's just so much associated with being a Christian to which I do not subscribe.
If you truly want to know what I call myself, I guess "a disciple of Jesus" would do the trick nicely.