Two things can be true at once, but most humans are good, it is the leadership that makes the difference. We are all tribal by nature and I have seen mass violence at soccer riots over the color of your shirt or flag in the most civilized cities of the world.
I am no fan of Islam, Islamism, and Islamic sharia, and not much of fan of organized religions. Ultra Orthodox Jews make me sick.
If you are going to have a contest, 50 million Europeans, raised in Christian homes, killed each other within a few years in WWII Europe, and 6 million Jewish men, women, and children were rounded up for extermination, while the Vatican remained neutral throughout the war.
Have you forgotten what 2,000 years of Christian love looked like in Europe, with all the wars, pogroms, inquisitions, genocides, slave trading, and the decimation of native tribes throughout the New World and tribal Africa. All the conquers that came to the New World and Africa were flying the flags of Christian Kings with the blessings of the Church.
I remember when I was fighting in Vietnam and we were killing people in their own Country, abusing prisoners, and defoliating their jungles and crops with cancer causing agents, clerics came to field to bless us for killing these so-called godless communists. They made me sick.