If they were stupid, this fight would already be over. They ain't and it isn't.
To quote the immortal words of Rodney King, "Can't we all just get along?"
You can follow the teachings of Allah, or Buddha or God or Isis or nobody at all. I will do what is right for me, and if my religion bumps your religion's elbow, I'll humbly say, "Excuse me please" and go on my way in peace. I won't judge you and I hope you won't judge me. Maybe our kids can go over to each other's houses to play together. They while they are doing that, we can sit down with some coffee or tea and discuss how we all want to be happy, and maybe what that means to us. We might see that we have more in common than we think. And the things we don't have in common? There's no need for us to fight about it. Just remember that we all have the right to live and be happy and enjoy watching our children grow and learn. And if we do our jobs raising those children, as best as we can, then maybe by the time my grandchildren are playing with your grandchildren, they'll come sit on our laps and ask, "What was war like?"