He is not.
I also want to take a moment to point out that not all Muslims are evil, America-hating terrorists. Saying that would be like equating all Christians to those Westboro "God hates fags" freaks.
Fundamentalist anything is bad, pretty much. That has nothing to do with this quick political service announcement though, since Obama is not Muslim.
Here is a Snopes article clearing up 50 Lies About Obama, there are a lot of mistruths out there, and Snopes does a good job straightening those out while still making for interesting (and short) reading.
HERE is a link where you can make your own Obama poster, like I did over there.
HERE are some panoramic, 360 degree shots of another recent rally.
What we don't want is more of this:
And yeah, I know that a lot of you don't like when I talk politics. You'll live. ;-)