How does your neo-Gnostic opponent view Christ eating, etc? If Christ's body is made new and is completely different from the bodies we have now, then truly it does not matter that Christ was 'enfleshed'. Since that which was not assumed also cannot undergo theosis, then there is no reason for the Annunciation and Nativity, which also means that we can never be all that God created us to be.
As far as I understand him, he believes that eating fish in front of Christ's disciples after His resurrection was part of what He called "I haven't yet ascended to my Father," as He told Mary in His "nolli me tangere" speech. In other words, His transformation from an embodied person to a completely immaterial person was still occuring, He was "in the making" of Himself as fit to ascend into the timeless Eternity without matter, without dimensions, etc.
As for the reason Christ was "enfleshed," my opponent constantly quotes St. Paul's words from Romans 8:3 that Christ came "in the LIKENESS of sinful flesh in order to condemn sin in the flesh." He completely denies the idea that Christ became fully human and that He remains fully human now. In my opponent's vision, Christ became "man-like" for a very limited time, and now, after His ascension, He is fully God and not a human or even human-like any more.
As for what God created us to be, again, my opponent's understanding of the first chapters of Genesis is that humans were created to be ethereal, not possessing any weight and even any "materiality" (Ukrainian "rechovynnist'," literally "substance-ness"). The Earth was made as a part of a completely different world, without mass, weight, dimensions and time. After the Fall, the Earth was "cursed" by God, and this "curse" meant a transformation into our planet's present state, when it has mass and exists in linear time. Humans, having been "transferred" onto this cursed earth, became sexual beings, and gradually, in generations, acquired this disgusting, evil materiality, this stinking rottening evil FLESH, this "heavy body."
My opponent sometimes quotes St. Gregory of Nyssa to back all these constructions...
Interestingly, there is a young Ukrainian Eastern Rite Catholic priest at "Maidan" who always says that my opponent's constructions are gnostic and hardly even Christian. But my opponent only gets angrier and blasts this priest (of his own denomination!) as a servant of anti-Christ, just like yours truly...
I would gladly abandon these futile online clashes, but there are many people who visit "Maidan" and have no idea about fundamentals of Christian faith. I am there mostly for their sake. But my opponent has perhaps 1,000 times more energy and determination than I do.