The only way to stop the fighting is for people to keep their religion or non religion to themselves. I once saw a quote that said something like "your religion is like your penis. It's fine to have one, it's fine to be proud of it, but please don't whip it out in public and start waving it around, and don't try to shove it down my throat". Your religion is yours, mine is mine, don't try to make laws based on yours, I won't try to make laws based on mine.
The problem is I really haven't seen very many cases where atheists or agnostics were trying to pass laws based on their beliefs, but we all see cases where prayer in schools is being pushed, and we all know that it isn't just any prayer but Christian prayer. I have no problem with kids praying, but being led in only one religions prayer is a no go have a moment of silence and let them use it as they choose.
Then there are the ones that are pushing to tell women what they must do with their bodies. I get it some think abortion is horrible, but not everyone believes that. Unless you are the one that has to live with the decision you don't get to make the decision.
Gay marriage, as a lesbian in the deep south I can tell you all about religious people trying to remove the right to civil marriage that we finally got passed. My marriage has nothing to do with anyone else, so why try to make it null and void by force of law?
Other than a couple of religious monument cases have atheists pushed for any law that requires others to live by atheist beliefs? What are atheist beliefs other than I don't believe in any God? As for the monument cases I think that if one religious icon is allowed, then they should be required to allow all.
See, I don't care who you are, but when you use your beliefs to intrude on another persons life we have an issue.