If they are unknowable, how can you profess their existence? If they do exist and are unknowable at present, do you reject the concept that they could be knowable at some point in the future, as we continue to learn more about the universe?

There is no shortage of things that were once perceived as mysteries, magic, and miracles that are now understood to be perfectly natural phenomena. That knowledge doesn't change how they affect us emotionally, any more than understanding how a rainbow occurs detracts from its beauty.

I'm a perfectly happy atheist and scientist. I don't need miracles, and I don't believe there are any. As a scientist, it's fascinating to figure out and understand how some little corner of the universe came to be and functions. Yes, I "stare at mystery with curiosity, not with awe like a believer." Perhaps there are ultimately things in the universe that truly are inexplicable by science (although I rather doubt it). That doesn't make them any more or less cool and interesting.