Religion never incurs war.
Ego incurs wars and all other manner of suffering. Ego is what corrupts religion, science, government, businesses and more.
Ego (not the western psychological definition, but the spiritual one) is self-concern and separateness.
Ego creates rifts -- me versus you. Ego likes to think of self as superior and always right. Ego is always entitled and likes to blame and belittle others.
But getting rid of ego and doing nothing else is impossible. You have to become Love.
Ego looks inward; love looks outward. Ego is self-concerned; love is concerned for others. Ego likes to be firsts; love is okay being last.
These are the lessons of True Religion taught by Christ, Buddha and Lao Tzu.