Heard someone describe himself as a 'cultural Jew' recently and realised that what I am is a 'cultural Christian' (daughter of two missionaries, brought up Protestant, adult confirmation, then realised in my thirties I didn't believe it). The Bible and liturgy are so much part of my life I could never separate them out, but I understand them in terms of myth and metaphor nowadays.
I don't like 'atheist' (though it is accurate in my case): 'humanist' works better for me because it's about what I do believe rather than what I don't.
I don't do off-the-shelf morals either, which is partly why I had to stop trying to be a christian. My old church's teachings on infant baptism, homosexuality, and other issues are frankly repellent.