Like most great heresies, it seems to make some sense on the surface. That's false teaching, and the Church rejected it. The body and physical suffering are intimately connected to Christ's mission of redemption. So Christians must really be involved in the suffering world, or we're spiritual Docetists. And our commitment to the suffering world reminds us of one other important thing.
Justice needs to be at the heart of all our evangelization efforts.
Now they have the land, and we have the Bibles. There is no Gospel life without a foundation in justice. That's the last command Jesus gave to us before returning to His Father. And it's a big one. But that brings us back to Mary, and to the Apostles at Pentecost.