> You can have wars but those rarely result in genocide. Civil wars had much worse outlook on that.

WWII and Nazi Germany

> However when there are Christians (or Muslim) in your country, it's pretty real that suddently the regime wants to kill them with their military and police and they have no force to stand up for them.

Yes, that's why you need strong institutions. The US has admirable (though not perfect) institutions that incorporate these concepts. In the examples you're citing, the institutions were fundamentally weak.

As I mentioned earlier, humans will _always_ find reasons to fight. You can get as white and Christian as you want, but soon some types of white Christians will start fighting other types of white Christians. Medieval Europe and its interminable wars was a great example of this.