Religion is rarely a major factor in most wars.Even in religious wars like the Crusades both sides were busy fighting and backstabbing their brothers in Faith as much as the enemy.
Ideology whether cultural, religious, philosophical, or nationalistic is a tremendous motivator for war. This is an off topic discussion however because the true metric of motivation is determined upon where people are willing to place their lives and money towards. Can wars be sufficiently maintained through voluntary fundraising(war bonds) and lack of conscription? If not than Bitcoin has a significant role in reducing wars.