Looks like it's been an interesting few days in this thread.
The suggestion that one needs religion to explain why I shouldn't grab an axe and murder my neighbours is a bit of a head-scratcher in how far it misses the point. Whether there's a God or not should make no difference when it comes to something like that. My neighbours (and all humans at that) are thinking, feeling creatures capable of experiencing pain, suffering, and sorrow. I have a deep empathy for other human beings that isn't tethered or generated by a belief in a god, but in legitimately finding the implication of suffering on another person to be a reprehensible thing. It is inherently an evil thing to do.
There is an evolutionary basis for us to have developed empathy and caring for each other. If everyone was running around hurting and killing each other, our entire species would suffer. Collaboration and peaceful coexistence is vital to the establishing of a society. Chaos and war is bad for everyone. Look at the state of the Middle East.
As for the use of foul language, I curse like a sailor. I'm pretty notorious amongst people I know for having an incredibly filthy sense of humour. I also enjoy getting rip roaring drunk from time to time. Nevertheless, I conduct myself otherwise in a way that I consider to be relatively "moral", for lack of a better word.
If there is a God (and I'm inclined to believe there is some kind of force out there beyond just us and random chance), I find it difficult to conceive of it being concerned with my common dropping of F-bombs and lewd punchlines when there are other people out there raping, murdering, stealing, and generally making the lives of those they come into contact with miserable.