The value system in Islam is completely different. Jihad is a core pillar of what they believe. It all boils down to struggle and submission - whether on a personal level or a larger tribal/national one. Their violence is kind of baked into the cake. In addition, they are not allowed to judge or condemn another Muslim's jihad. This is why they never speak out about the brutality and oppression of other adherents. When dealing with the outside world they appear united under the banner of Islam, but among each other their differences take center stage often erupting in violence. You are right. It has been a long time since Christianity's internal differences have erupted into the kind of hatred and violence we see from Islam. Christianity has developed more of a live and let live mindset when dealing with other Christians realizing that those differences should not violate our core beliefs of love and compassion.

Then there is the whole issue of how they deal with non-Muslims/infidels - even if they are technically dealing with another Muslim. Infidel Muslims are not treated much better than a non-Muslim. Christianity values treating others fairly and with compassion. Not so in Islam. They are given permission, if not outright mandated, to treat others badly and bring them under submission to Islam - with violence if necessary. Christianity had a history of that kind of forced submission to the faith but thankfully we have moved beyond that level of power seeking often driven by organized Christian centers.

So trying to maintain a lasting peace among these people is not likely because it has everything to do with how their belief system is built and what it stands for - struggle and submission versus love and compassion. This is also a main reason why Christianity and Islam are not compatible.