Having spent a bit of my youth as a "Born Again" Christian (I lean towards secular Buddhism now), I noticed that there are quite a few engineers who also see themselves as fundamentalist Christians. I think
that it's not so much engineering gives you good "terror skills" (although there's something to be said for that argument), but points more toward the notion of the generally conservative engineer, or at least one
that doesn't take too holistic a view of the world, thus making them ripe for all sorts of fundamentalist thought be it Islamic or Christian.
Frankly I think the neo-cons and Jihadists are just "brothers from another mother" to a certain degree. Fundies are fundies no matter what they believe... it's just they think they have an inside-scoop on how things ought to be, everybody else is wrong, and the world needs to be corrected to fit their views.