When Jesus told His disciples to 'let the dead go bury the dead', what do you think He meant to convey to them?
All of those who need the Salvation Grace of God in Christ are made in the image of God, as trichotomous beings, having what Paul addressed to Timotheus: body, soul, and spirit. Before being born again, we are not dichotomous beings, because one of the three sapects of our being is there, but dead without God-Life in it. Jesus is the Grace of God, and by Him is the existing spirit in man's soul made alive again, thus being 'born again'. When we enter this air world from the water world, we bring with us all three components which have us in the 'image of God'. That is the state which Adam enjoyed when God breathed into him the breath of "REAL" Life, God-life. The humankind around Eden (and specifically 'eastward from eden) did not have this trichotomous reality since it was not created in any created beings until it was manifest in Adam and His descendants. The breath which came into humankind prior to Adam originated in the natural world and was of the natural sort. The breath which God breathed into Adam that made him alive was of the spirit; Adam did not come forth from the water world of amniotic fluid. But all of Adam's descendants do come froth from that water world, hence Jesus told Nicodemus that unless a man os born of water AND the Spirit, he cannot see the Kingdom of God. That is the way God does it now, since Adam fell from Grace. When Seth came along, man again began calling upon the Lord ...
So an unbeliever does have the faculties to discern spiritual things, as opposed to soulish and physical things?
1Cor2 seems to indicate otherwise as does my experience with believers and unbelievers.