The terrorists who flew airliners into the World Trade Center were willing to suffer a truly sadistic death (as well as extinguishing the lives of many innocents) because of their religious belief, conviction and attitude of utter certainty.
True. However, although I'm largely agnostic, (in other words I don't "know" anything from a religious standpoint for sure"), I sense, for most Christians, it's not about absolute certainty. That's fundamentalism, (which some are, such as jws), but not the majority. Christianity is mostly based on faith, not certainty, and it certainly can't be proven on purely a rational basis. It also cannot be UN-proven on purely a rational basis.
j