What is so wonderful about a mystery? Isn’t the fun of a mystery being able to figure it out? Do we want to cut off certain areas of exploration by saying ‘it’s a mystery’ and be done with it? I don’t think so, at least I know I don’t.
If you become aware of some ‘truth’ and purposely avoid recognizing it on a daily basis for the benefit of keeping your ‘mystery’ alive, then you are cheating yourself of growth. An example might be purposely not reading any articles or books on science because you prefer to hold on to the ‘mystery’ of how the universe works, small and large. You think that by remaining ignorant the ‘mystery’ can continue to exist.
The problem, of course, is that your purposeful ignorance doesn’t allow anything to continue except your ignorance. Truths are still discovered, new ideas about life are still put forth and explored, new ways of viewing the human experience are still brought forth AND new mysteries continue to enthrall.
But you, if you are fearful of learning those things, don’t get to find new truths OR new mysteries. You just get to remain ignorant and boring. Don’t fear your religion, whatever it is, running out of mysteries, it won’t. The more you learn the more mysteries you will have to enjoy.