CCC 398, “…man was destined to be fully "divinized" by God in glory…”. Even without sin, we were destined to rejoin Christ. Redemption of sin was not the original reason for Christ (since sin was never intended), communion was the reason. Sin was an unintended obstacle that Jesus Christ overcame, before he could make his originally intended communion with humanity.
2Pet 1:4, “…he has bestowed on us the precious and very great promises, so that through them you may come to share in the divine nature...”.
Mt 25:34, “Then the king will say to those on his right, ‘Come, you who are blessed by my Father. Inherit the kingdom prepared for you from the foundation of the world.’”. As planned, God (Christ) intended us to go into creation and then return to his divine person.
Related verses for divinization: 2Pet 1:4, 1Jn 3:2, Lk 6:40, 16:26; CCC 260, 460, 795, 1988. Related verses for the faithful as the literal body of Christ: CCC 790, 795, 789; 963; 1Cor 12:27, Rm 12:5, 1Cor 1:2, 1Cor 6:15.