@neologist,
There are plenty, I'd say. I'm not saying that I know for sure that we'd be better off without religions, but I'm not sure that we'd be any worse off without them, either. I suspect that human history may have evolved pretty much the same either way. Maybe people just use religions to justify doing what they are prone to do anyway. Seems you can justify pretty much anything given a particular religious text. I've already mentioned slavery, genocide, etc. On the other end of the spectrum, as far as I can tell, random acts of kindness, generosity, love, etc, occur in non-believers with about the same frequency as in believers. Not that I've done a study on it, mind you.