That doesn't necessarily rule out al qaeda involvement, there have been caucasian taliban et al before. But we shouldn't jump to conclusions until we have the facts regardless.
Arabs tend to be caucasian as in Europoid - they're semitic, and semites are usually Europoid. I don't have a word for what you wanted to say readily available, sorry.
"White people" is a perfectly reasonable term; you don't need to dress it up if that's what you mean. Genetically, it's not totally accurate ( http://en.wikipedia.org/wiki/White_people#21st_century ) but socially, it's a thing.
Yes, but only to an extent. There are no (to the best of my knowledge) actually blond arabs (though hair dye is a dime a dozen these days, of course). And Semites can generally be readily identified by certain features that while they can be shared with Caucasians are rarely not present on Arabs (bridge of the nose, the brow, the eye placement, etc.).
Race is determined by genes, not looks. There are, AFAIR, only five human races and arabs, being semites, belong to one of those called "europoids" (aka "caucasians").
I remember the Oklahoma bombing and the first picture was of some random brown muslim guy. Turns out, it was a white athiest.
Look up the FBI stats on radical muslim bombings on US soil vs radical christian vs radical athiest bombings. In fact, I seem to recall that radical jews had more attacks on US soil than radical muslims.
And since 9/11 was so neatly sown up, we'll never really know who was truly behind it.
Come on man. You are delusional!!! Terrorist attacks are 90% by muslim extremists... Stop living in a fantasy world... new york, washington dc, london, spain, egypt, turkey, mumbai, kenya, yemen, thailand, Philippines, russia etc... I am not saying all of them but 90% is probably very accurate...
Instead of blaming it on others, it should be addressed by the muslim world and not just denied. When a radical christian does something like, he is denounced by all christian leaders and people.