The problem with Christianity is that until recently, it really wasn't termed "Christianity". It was Evangelist, Baptist, Protestant, Catholic;etc. Now, people lump them all together despite having completely different beliefs and different resolves aside from the one single unification: Jesus Christ. So when Catholics start abusing young children and start getting away with it without any repercussions, people are going to label it as "Christian" and not prominently Catholic.
But this just reinforces Triumph's point about moderate Christians not really speaking up and letting extremists high jack their religion. I think a fair person would argue that most Christians - at least in the west - are of moderate principles and that fundamentalists are a minority, yet a highly vocal minority. Moderates claim to say and do one thing, but when shit hits the fan, and their voices are needed in light of people without faith, or of another faith entirely, they are nowhere to be seen.
Oh sure! You'll find the occasional church with a rainbow flag waving, but is that really enough of a statement? I don't think it is. I agree with Triumph in that moderates tend to be enablers.
And your point about moderate Muslims makes no sense, because there are plenty of moderate muslims in western countries and the difference between them and moderate Christians is that for the most part, they really do stand up for their views and principles in light of extremism. But a bulk of moderate Muslims, I've found, depending on country or culture of origin, makes some prejudicial claim against Jews.