That was a time when all people were ultra-violent. In addition, the Christians were attempting to take back by the sword what the Muslims had conquered by the sword (and what the Romans had conquered by the sword before them, before the Romans' relatively peaceful conversion to Christianity.) This is common to people everywhere, and not every location abandoned the high levels of violence at the same time. Even in the seventies, Buddhist monks from different temples in Vietnam fought in the streets, and Buddhists are arguably the most peaceful of the major religions. Christianity however largely gave up violence as part and parcel of spreading a religion, or practicing it. Granted, parts of Africa are still an exception, as are scattered individuals of every religion. Islam has not given up violence. If anything, Islam has embraced more violence, both against non-Muslims, against Muslims of different sects, and against women, in the twentieth and twenty-first centuries.
As an example, one can find mobs killing in the name of Islam among Arab, Egyptian, Iranian, Afghan, Pakistan/Indian, Indonesian, Maya, and African cultures, often on the basis on outlandish rumor. Outside of Africa, the only correlation one can find among Christians or Hindus or Buddhists is in scattered reprisals and in a very few situations such as in Serbia, where ethnic Albanians were invading and taking over a country. Hardly the same thing.
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