Once we reach the real end of the elongated ‘end times’ in which we are presently living the Church teaches that there will be a general resurrection of all bodies. Here’s the question: why?
There are two big answers to this question.
The first overall answer lies the rich theology of restoration that is centered on Christ. This teaching, rooted in Scripture and articulated by Church Fathers like Irenaeus and St. Augustine, holds that Christ, in reversing the curse of original sin and redeeming a fallen world, restored all things to their original goodness. This is based on such New Testament texts as 1 Corinthians 15:20-28 and Ephesians 1:8-10:
In all wisdom and insight, He has made known to us the mystery of His will in accord with his favor that He set forth in Him as a plan for the fullness of times, to sum up all things in Christ, in heaven and on earth.
In the recreated new heavens and new earth, of which we read in Revelation, it would be most weird indeed if the pinnacle of creation—the human being—in which the lower material and the higher spiritual realms were united in one, was not fully resurrected. To be half of what we once were, disembodied spirits flitting about would indeed seem odd. The resurrection of the body affirms its original goodness. It’s not a matter of heavenly necessity, but it is most fitting for the plan of redemption.
—from the on-line article The Resurrection: Why Do We Get Our Bodies Back? by Stephen Beale