What your implying is that because everything has to have a meaning, belief and the assumption of the unknown is better than what we already know. In which I kindly have to disagree. Reality(that which occurs around us every single day and that which we don't know and question for further knowledge) is very important. Even more important than belief. What are we if we blindly follow the words which we are told or the things we read without a pinch of curiosity. How can we try to at least understand things as it really is if we're not open to explore ideas and theories other than our own?
I would rather say belief is one of humanities greatest draw-backs. Sure it has it's benefits and it's something that is psychological. But it limits us from further thinking and challenging our own belief.
And also belief is one of the major causes for conflicts upon nations since the beginning of men. Since belief can turn into dogma's. And dogma's can turn people into extremists. Which is not something we'd want if we were to further develop as human beings living on this planet.
So wouldn't it be better to focus on the present? What we do know about reality? What we can discover about the mysteries of the universe?
The best way to approach the unknown is by living with the fact that it's the unknown. And that our tiny little brains(in comparison to the large massive universe we live in) cannot possibly understand everything that goes around it. So just because something is known/unknown, doesn't mean it has to have a meaning. It's there. It's reality. Just accept it as it is and embrace reality for it's beauty