A god that allegedly used to show up 3,000 years ago, a kid that was supposedly here, briefly, 2,000 years ago, and both only for the benefit of a tiny backwater group of desert dwellers, cannot take credit for, or hope to usefully influence, people in 2013.
Moral standards have been expressed by cultures for ages. Granted, they differ from group to group, though axioms like the golden rule tend to get expressed across societies. It is apparent from studying other primates that we have some built in moral standards, plus some built in double standards as well. So we combine the cross-pollination of cultures, our genes, common sense, maybe a little Anthony Weiner-type public shame and as many examples of approved standards as we can muster, and we humans are sort of able to be fairly moral on our own. Yes, there are exceptions, but in a world where free will isn't free, power isn't nice and selfishness wins too much, we aren't doing all that bad.
There is always room for improvement. And most of us are moral enough to realize that.