Why are we resurrected to eternal life? (This being the central and strangest claim of Christianity.)
A child's understanding is probably the correct one - it might run like this...
If I am going to live forever I want to do it in a body, of course!
If I lived-on just as a spirit it would not be me.
I don't want to be just a ghost, forever.
If I lived forever as a ghost, that would be as bad as a dream - it wouldn't be really-real.
For things to be real they need to be solid.