When the Muslims is a small quantity among another religion, one can live peacefully, but when there are more Muslims, then disagreements that lead to violence begin.
I can give you hundreds of examples. One famous example is that of Kosovo. It was historically a Serbian province. And for the Orthodox Christians around the world, Kosovo is extremely important. Remember the Battle of Kosovo, of 1389?
Things were normal until the Muslims became a majority. Once they became the majority, they started their ethnic cleansing campaign against the Christians. Now there are hardly any Christians left in Kosovo.
I was in Kosovo before the war in Yugoslavia. Do the Muslims attacked the Serbs as well as Serbs attacked them. It is very difficult to find the culprit in civil conflicts, but I've always been on the side of the Serbs.