...(the Islam religion as far as I understand is peaceful)

the problem, in a way, is that Christianity and Islam are the only world faiths that claim to be for all the world, and therefore require their followers to evangelise others (please note that I have NOT used the term proselytise, because this has both a very specific meaning and is also hugely abused by governments and people who want to denigrate such faiths).  Inevitably, there will be some tension and friction when the two meet.