Religions do not cause wars. It is sin that causes wars. It is man’s self-centered, self-serving nature and his inability to sacrificially love his neighbor and live at peace that causes wars. If all mankind followed God’s will and ways there would be no war. But we know that won’t happen because of man’s sin nature.
So man continues to war with his fellow man and some have used, and still do use, Christianity and other religions as their justification. However, that does not mean that religions are the root cause of wars anymore than we could say politics is the root cause. Religious and political beliefs may influence warring men and women, but it is the people themselves who enter into wars.
War is a choice, and so also is peace. All wars start when leaders fail to chose peaceful methods to mediate the issues between them.
The Creator, Redeemer, and Sustainer God of the Bible calls His people to make every effort to live peaceably (Rom. 12:18). And in His Word, God gives directives on how that can be done (Rom 12-16). The Bible’s Judeo-Christian morals, ethics, and teachings, when followed, actually prevents wars. The further away from God’s teachings any person is, the further away the person will be from seeking and finding peace with others.
Changing the hearts of men and women by turning them to Jesus is the only way to stop wars.