V.29-30 These verses don’t mean to be baptized for a person who had already died. What they do mean is that baptism signifies identifying myself (as well as all those who have already died believing) with the death of Christ. If there be no resurrection, what would be the use of becoming a Christian? If the dead don’t rise (v. 16) then those believers who had died have perished. Baptism in those days was so serious an act that those who did get baptized put themselves in a position where they might be murdered at any moment. Like giving yourself up for dead.
V.33-34 Satan was introducing these lies to cause people to indulge in evil.
V.35-36 Paul describes these thoughts as foolish.
V.37-44 The body that has been redeemed is the body that shall be raised, although changed to a glorified body fit for heaven.
V.45-49 The first Adam and the last Adam (Christ) are contrasted, also the earthly with that which is heavenly. We believers are now like our Head, we are heavenly.
V.50-54 The mystery is explained. Read 1 Thess. 4:13-1813But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope. 14For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him. 15For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep. 16For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first: 17Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord. 18Wherefore comfort one another with these words. (1 Thessalonians 4:13‑18) — the coming of the Lord for us believers. In an army, the last trumpet was the one that set them in motion.
V.55-58 If this truth takes a hold of us, it makes us diligent in serving the Lord.