Really? In the engineering education I've been exposed to (I'm in a Canadian engineering program right now) they heavily play up the importance of eliminating bias and groupthink to find the "best" option. There's an immense stress on the idea that there is no "right" option, and that even the option you choose to be right has to be properly sourced and cited with a fully documented process, so you are accountable for your decisions. In fact, that accountability is an immense part of the "professional" part of the education, and I'd argue that's why engineers wouldn't make good extremists; they'd be looking for the kind of backup that just isn't there with some religious beliefs.
Add that to the fact that hackers and nerds, more so than other groups I've seen, tend to be more questioning of traditional religions than the average person - and it's not just me who notices.