Yes it did spread some what violently, just as Islam and ever peaceful Buddhism and Zoroastrianisms did. But pros vs cons are clearly in Christianities favor.
You think so? Where in the Bible is written than people should unite against their enemies and slaughter them if possible? That was the european nature, judeo-christianity want to destroy so much. Why? To control and thus rule us. Not gonna happen.
Thous shall not kill… and all the rest. Violence not included. Hypocrisy detected. Case closed.