That viewpoint, the purpose of this life is to get ready for the real afterlife, is so dismissive of everything in the universe that is not us. Only humans get to heaven, in the traditional view with the harps and streets of gold. No dogs, cats, birds. No plants, trees, soil, rocks. No water, even.
So, what is the purpose of the millions of plants, animals, rocks, etc that have no interactions with humans? Why are there non-human living things in the middle of the jungles, on the sides of mountains, at the bottom of the ocean, in the Antarctic--or inside of other living things? Why have other stars and planets? What is their purpose? To just be there, providing background, like temporary props in our silly human play?
How can people fit the entire universe with all of its wonders into "we humans are the ultimate point of everything"? And they call us arrogant.