Christianity has the misfortune, I suppose one would say, of being so popular. Let's face it, the majority of the people in the world are prone to doucheyness. When a single religion includes 33% of those douchey people, yeah, the whole religion is going to look bad. One also has to take into consideration Christianity's origins. Their first big thing as a religion? Getting fed to lions. And they very quickly went from being persecuted to ruling what was at the time the largest and most powerful civilization in the world. They never had to learn how to get along with others, and they don't have many examples of how to live with non-Christians peacefully and without attempting to dominate them.

Then of course, there's all the misunderstandings of their own religion. Most Christians (or rather, it seems that way), believe some ridiculous things about Christianity and the mythology it takes from Judaism. For instance, all but a handful of the Christians I've met believe the serpent in Genesis is Satan and Satan is Lucifer and all of them are evil, naughty people. They believe in the "Rapture". They believe in Hell. There is no scriptural basis for any of this, and yet they believe it so completely that they feel the need to preach about it. I blame this partially on Christianity's open door policy, in that anyone is Christian if they believe Jesus was the messiah. This, unfortunately, includes people who either have not read the Bible or have read it but read it with what they wanted to believe it says already in mind.