Hmmm. Well, in the big picture, historically, the Christian faith has been responsible for a lot of bad things. And it is to a degree true that for a time Muslims and Jews were kind of accepting (the Jews have rarely been in the position to oppress people, but then their was the founding of Israel... and early Islam didn't force conversions, but terrible things have happened since)....
Generally I don't criticise any religion, I understand their are bad eggs in all, and I don't mind people having faith, whether it is similar or different from my own. However, there is room for making observations, and really Christianity has had a lot to answer for, which makes criticism understandable. Equally so, it is pretty much the worlds top religion, and many on this forum come from "Christian" countries. As such, it is what people know, and experience, and therefore know the most about...
But everyone criticise it? I don't think so, and if thats true, it is usually constructive criticism.