- are all wars - religious wars? -
No...I personally don't believe so. Religion has been so ingrained into cultures and society that you can - if you try hard enough - connect a particular religion to wars or just about everything. There are many wars that have been solely about religion I guess. Religion has always created division and sometimes the opposite. A particular religion of a group of people will be also their culture and tradition - things that differentiate them from everyone else. That in and of itself will naturally create conflict when another group of people with a different religion comes into contact with each other.
I personally don't subscribe to any religion. I was raised as an extreme Baptist in the Southern USA but have long since abandoned that belief. I believe in a God or Prime Creator although that is as far as I go. My religion is to do no evil and do unto others as you'd have done unto you.
I think organized religion has done great damage to our planet. It's done some good ,yeah, but it has also done bad.