In all honesty, I'm with brakeman.
There is absolutely nothing positive about religion. If you lose the god and the magic, it is no longer religion. The only positive outlook of religion are magic shows because at least magic shows tell you the Truth in that they are tricks, not actual occult magic or any acid trips of the sort.
If you really want to talk positive of religion, I see it as shooting yourself in the foot, because religion serves no purpose that secularism can't give as well.
If you are in need of a social club, just go find some people who share similar interests with you, and there you go. I'd rather go to a social club where everybody is obsessed with the bands that are about to play, or the pro-wrestlers are about to compete, or a particular team is about to play on a stadium, or wait and meet an artist and author instead of a social club where you not only look like a fool, but are being lied right to your face, with a straight face at that.
Even without religion, you can always go to philosophical social clubs. A couple posters mentioned Buddhism (consisting of many atheists) which is a great start. I constantly spout LaVeyan Satanism since that is another atheistic philosophical club. In case you are worried about it being to religious, most LaVeyans are not card-carrying members, but there are members by personal views and by association.
Take away philosophy, I still have television, movies, wrestling, a little bit of MMA, Metal music, classical and folk music, politics, and video games, among a list of who knows what else to get me to be socially active if I need a social club.
What is 1 positive thing that atheists can learn from religion other than nothing?