You could say all wars were fought over religion, or none at all. Remember how we were taught the American Civil War was fought over slavery? It's all in the interpretation.
War isn't the issue here anyway. Obviously, anyone who starts wars, is ignoring basic tenants of just about all of the big religions.
The issue here is freedom to practice, or not to practice religion. I choose not to practice, and I don't want people telling me I have to, or saying to me that I'm wrong and will turn to religion in the future. That is an insult to my ideas and quite disrespectful.
People have many, many times a day they can pray or do whatever they want to do. If you think people are better off with religion, and think it should be forced or at least encouraged, than get an amendment to the Consitution passed.
And for whoever was saying there is less religion going around now, than 50 years ago is greatly mistaken. Forced prayer was taken out of school, and rightfully so. Other than that, things are pretty much the same, if not more religious. Members of government use religion more, and religion is invading science. There is more religion in movies, television, and music. Basically, we're constantly surrounded by something that has religion in it.
Another thing: keep in mind the founding fathers were not Christian, but rather deist. Meaning they belived there was one God, and that's it. No Jesus, no Bible, just God. In fact, it is well established Ben Franklin attended meetings of the first Satanist organizations. I'm sure none of them would be too pleased with what is going on today, in terms of religion.