Nobody cares about the spiritual component, because that is useless, meaningless nonsense that can be whatever you want it to be. Care or don't care. Believe it or don't. Hold one of the billions of versions of the belief. It matters to nobody but you.
Yes, we understand how the physiology of earth creatures came about. We understand how environmental pressures can produce structures that are useful, for one reason or another. If the environment changes, so do the pressures. We can always (and we always will) learn more. Again, without any help from any of this metaphysical hooha.