Yeah. I am somewhat Christian too (though not very religious. Heck, I am closer to agnostic than hc-christian) and I laugh at those jokes too.
However, make one joke about Muhammed and you are going to die.
All religions have violent pasts, but it is muslims who nowadays acts mostly in destructive way. I mean, I have never seen Christians marching with guns and placards and shouting death to the muslims in streets.
Yes, I know very conservative christians (Urgh, I hate them) do stuff nearly equal to this (God hates faqs etc.) but you have to admit that averahe muslim is much more religious than average christian. Thus big masses with AK's.
And it is hard core muslims with their Holy War, not christians on crusade.
Also, most muslims (does they have right for it? Yes and no) wants to destroy Israel. Not just few terrorists.