My take on culture is that it cleaves to the aesthetic but cleaves from the religious (I do not know whether moral and religious are one and the same). I feel culture is expression of the experiences of life. If the mode of expression is common then culture can bind people together like nothing can ( case in point India and Pakistan). If expressing problems/experiences of life is culture then the extension of that - finding answers or solutions to the problems goes into the realms of religion. And nothing can divide people like religion. Those are just my thoughts on the subject.
Ps: and now I'm all talked out on the issue. Gasping for breathe.