Didn’t St. Paul say, “It is no longer I who live, but Christ who lives in me.”
So, was St. Paul an “alter Christus”?
Surprise, surprise... no reply. That figures
BINGO! Christ within the believer. Christ's righteousness in the believer. Christ's obedience in the believer. Christ's mercy in the believer.
Thus men do not become Christ as Rome wrongly teaches. Believers remain human, yet they are indwelled by Christ, the Holy Spirit as a free gift from God to His own.
Keep thinking alone those lines. God willing, the truth will become even more evident.