How does spirituality help people understand the universe in which we live?

I don’t think it does at all; I think spirituality is really just a coping mechanism that people have invented and that is not based on any evidence or rational thought process. Spirituality is the sand in which people stick their heads like ostriches when the truth gets too hard for them to accept. But religious people (especially Catholics for some reason) keep telling me that science and spirituality are two methods of understanding the universe. How can imaginary nonsense help people understand the universe?

It won’t help you obviously but for those of us who believe it helps a lot. Knowing the creation teaches us about the Creator, and knowing the Creator tells us a lot about His creation. Maybe it is you who have your head stuck in the sand. Think about it.