Scott Adams, creator of "Dilbert", recently ran a series of cartoons comparing office politics with the Easter story. While many people thought they were funny, others found it offensive. In fact, given how close those strips ran to the actual Easter, I suppose a lot of people were very offended indeed. Adams's own blog claimed that he'd received several letters of complaint.
I'd like to point out something to our Muslim extremist neighbors, though. A cartoonist offended many Christians with drawings of a satirical Jesus just before arguably the most import holiday in Christianity, and yet there have been no reported threats against him. None. Some of us laughed, some of us got angry, but no one condemned him to death. This is how civilization works, and you'd do well to observe and learn from it.