We might need to define purpose. When most people talk about wanting or having a sense of purpose, I don’t imagine that they are usually talking about survival. I suspect it’s usually something positive and desirable.

Natural selection has no purpose itself, but it creates all kinds of behaviors and attributes we could call purpose. In this case, a desire to be of use to our fellow humans. In a turtle's case, a shell to protect it from predators.

No, there is no religion in any of this. Just human experience and science.