Because This is America and freedom of religion has natural limits as do all unalienable rights. You may not yell "Fire!" in a crowded theater and you may not kill someone for drawing a cartoon. If you don't like that, get out.
This is the winning entry from the draw mohammed contest in Texas as posted on the American Thinker blog. The artist is former muslim Bosch Fawstin. I offer him my congratulations on his winning entry.
Have you seen it on any of the MSM reports about the attack on that contest? Think about that.
I recommend that all Americans draw mohammed and send those drawings to your local papers in support of free speech.
"Ye that love the Lord, : he preserveth the souls of his saints; he delivereth them out of the hand of the wicked." ~ Psalm 97:10