I heard a preacher say that when Jesus comes back, dead Christian's bodies would have life again. But this isn't true.

Great question you raise! That preacher was not confused or mixed up. He was actually quoting 1 Thessalonians 4:16-16, which reads, “For the Lord himself will come down from heaven, with a loud command, with the voice of the archangel and with the trumpet call of God, and the dead in Christ will rise first. After that, we who are still alive and are left will be caught up together with them in the clouds to meet the Lord in the air. And so we will be with the Lord forever.”

When Jesus returns, all who died prior to Jesus’ Second Coming, who have accepted Him as their Lord and Savior, their physical bodies will be resurrected. Remember, we have a spiritual body (our souls) and a physical body. When we die, our spiritual bodies instantly go to Heaven but our physical bodies are still here. Anytime the Bible speaks of a resurrection, it is a physical event involving a physical body. So, those who area dead in Christ will receive resurrected bodies.

Don’t ask me how this works because it is one of the mysteries God chose not to reveal. However, we can be assured that those who died before Christ’s return will be first to ascend then those who are alive will go up to meet them. All of the believers will receive resurrected, “glorified” bodies.