We just need to feel we know, or we can't rest. And yet much of life is unknowable and will remain so. Lots of religions try to deal with this by inventing explanations and myths.
But myths only work if you don't try to turn them into factual explanations. If you try to turn your myths into literal, inerrant truths—if, for example, you start insisting that Noah really did build an ark or that the Earth was created in six days a few thousand years ago, it just becomes a big, huge mess.