Scriptural harmony is key to understanding.
“It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.” Jn 6:63
Paul to the born again (saints) at the church in Rome: “But ye are not in the flesh, but in the Spirit, if so be the Spirit of Christ dwell in you...”. Rom. 8:9
“And I will pray the Father, and he shall give you another Comforter, that he may abide with you forever.......AT THAT DAY ye shall KNOW that I am in my Father, and ye in me, and I IN YOU.” Jn 14:16-20
Holy Ghost baptism. THAT is when you REALLY have Christ in you (”the hope of glory”).
Yet when Catholics point out obvious Scriptural inconsistencies held by Protestants, we are told such things are "spiritually" (whatever that needs to mean) discerned, or similar rationalizations.