You know - this is a get the f### over it issue. Really - grow up.
You want to sound like an immature prejudice fool - feel free. But really, I know many Muslims, and not one of them has blown up anything that I am aware of. Strangely enough, my Christian friends haven't blown up anything either.
Confusing extremists with people is a silly thing to do. Your average joe religious guy just is trying to find some direction and internal peace in his life. If you don't agree, that's fine and we are very blessed to have born in a nation and land that allows us to make that choice for ourselves.
Not everyone is so lucky or fortunate - and those people will likely never see this website in their lives.
If you are not of Muslim faith, then by all means, don't buy the stamp. But, if you disagree with the post office putting out that stamp, then you really have to consider that the post office should be fair all around and not put out Christmas, Haunakah, Kwanza, Easter, or any other stamps that reflect any sort of religion whatsoever.
Nations and individuals have attacked us. They have manipulated people by distortions of faith, religion, and belief. Don't confuse those lies with the Truth of what the religion stands for and all that it holds to so many individuals.