People, "Islamic" is not a word. Neither is "Islamist." If you're looking for the adjective version of Islam, it's MUSLIM. Now, whatever we all feel about whether or not there should be a Muslim center blocks from ground zero, I hope we can all come together and rally on common ground.
Grammar is everybody's problem.
If I hear one more journalist, pundent, or politician say "Islamic" or "Islamist" again, I'm turning the channel. It's a simple zero-tolerance policy.
While we're at it, the plural for "person" is "people." Not "persons!" We have no need of that word. Also, the act of moving is called "motion" - not "movement!" But we've been lax so long that both persons and movement have become accepted and proper English. We've got to draw the line somewhere.
The word is "Muslim," people. Say it with me. M-u-s-l-i-m...