Ok. I'm an atheist and I'll answer this topic.
Religion has, though the ages given both good and bad sides to the spectrum.
True, it has been the crux of countless useless wars and persecutions, but that was when it was used as excuses by bigots and power hungry leaders.
However, anything that can give hope and determination to the poor and the downtrodden, and help usher in golden ages of knowledge (yes, it has happened) and peace, for as long as they last, has it's point and it's respect in my eyes. Ever look at the good that various religions have given the world? Buddhism, Islam, Christianity, etc, to name a few, have all done their good (though, of course, Christianity is more often assiociated by non-Christians with the persecutions done in it's name).
I'd say, all in all, the world is better with religion here. Hell, if religion wasn't here, the wars and bad effects probably have happened, just in a different venue. People tend to be like that, through the ages.