
This science is naturalistic; only what is scientifically knowable (i.e., by the five senses) is real. In principle, such things as God, souls, and mental states (i.e., non-physical things like thoughts, beliefs, and experiences) cannot be known to be real. Or, simplifying, they don’t exist. Yet, we can test natural, physical stuff scientifically, so that is what is believed to be real. That view of reality is the philosophy undergirding atheistic evolution by natural selection (NS) – naturalism. There’s only the physical universe, without anything non-physical.