I don't have a problem with the unexplainable. Indeed, I think that the unexplainable is the sort of thing that keeps us searching, reaching for answers. The unexplainable is, in many ways, the motivator of humanity.

I think that spirituality (and I say this with all due respect, because I know how important spirituality is to some people, and I would never wish to remove it from them) can often be used as a way to deal with humanity's broader fear of the unknown. Some people are incredibly uncomfortable even thinking, let alone uttering the phrase "I Don't Know". Adding to that, there are also people who hold onto the thought of a higher power because even if they don't know, they need to believe that someone does. People trust heavily in the "truth" of science in the same way for the same reasons, and some have the same religious fervour about science as they do about other things - which is not the point of science. The point of science is to question everything you know until you have a the best answer you can get with the information you have, then move on.

The idea that there are things that you can't go to the library to find the answer for is intensely frightening to some people, but I think that that's what really drives our future as humans.