Yeah, you’ll notice, though, that I’m not talking about our resurrected bodies but only Jesus and the use of his body
Jesus’ resurrected body is the sign of what ours will be like, so the two aren’t unconnected.
I will attempt to answer your questions. Please understand, though, that the reason many of us have demurred or disagreed with each other on the details is that we don’t actually know the details for sure – no one has had the opportunity to x-ray a glorified body, given that we know of only one that has physically walked the earth and that was long ago. This is largely speculation on our part, so it’s hardly fair of you to call us to account for what “our colleagues” have speculated.
First, Jesus since the Incarnation is both God and human. That means He has both a human soul and (except for the period when He was dead after the Crucifixion) a human body. Since the Resurrection He has possessed what we call a resurrection body or a glorified body, which is still His human body but seems to lack many of the limitations of our current bodies.
As I said, there were no x-ray machines available during Jesus’ time on earth between the Resurrection and the Ascension, so we don’t know what His insides were like. We’re told that He ate food, breathed, and spoke during that time, which would suggest the presence of lungs and a digestive system at least. However, since we believe that resurrection bodies cannot again die, it must be that whatever organs He had were useful for the purposes of eating and speaking but no longer necessary for life. Hence the answers you’ve been getting, that the resurrected Jesus can breathe and eat but does not need to.
The question of the resurrected life in Heaven is even more mysterious. We know that the primary joy of Heaven is simply to exist in God’s presence, which we believe the blessed dead are doing now even without bodies. However, as you note, it is a key tenet of Christianity (and Judaism before it) that someday the bodies of the dead will be raised up and reunited to their souls. At that point, they will be glorified bodies such as Jesus now has. That suggests that there will be some kind of physical, time-and-space reality to the resurrected existence, and therefore that the mentions of amazing sights, sounds, smells, tastes, and textures in Heaven are not entirely metaphorical. Presumably Jesus’ human body, along with that of His mother Mary and possibly those of the 2-3 Old Testament saints who are implied to have undergone bodily assumption, is already able to experience those pleasures.
Now, does having a human body (and soul) add anything to God? Of course not. As others have stated, God freely chose to take on human nature, not for Himself, but as part of His plan to bring us back into the family. As Jesus, He was able to show us both what God is really like in human terms and what a perfect human being was like. His life of perfect obedience and willing, innocent death somehow balanced the scales of God’s justice for the sin of Adam as well as all of our personal sins… (Exactly how the atonement “worked” has prompted numerous competing theories among Christians and is beyond the scope of this thread.) Even now Jesus is both God and man – not, importantly, a man who was deified or a god who merely took on human appearance temporarily – and therefore serves as the unique intercessor between us and the Father. (“Yahweh” is one possible rendition of the Name that belongs to the entire Trinity. We call the First Person “the Father.” As with the atonement, we can tackle the mechanics of the Trinity in another thread if you like.)
Does any of that absolutely require that Jesus have lungs or veins? It doesn’t seem so directly. What it does require is that He be a true human being, both during His earthly life and for all eternity to come. A human is a body-soul composite, and therefore Jesus has both a human soul and a human body inextricably united to His divinity. And thus we come full circle to the connection between Jesus’ resurrected body and ours. If we will have lungs and veins in Heaven, then so does He now. If our resurrected bodies will just be awesome-looking replicas without functioning organs, then that’s what He has too – but we cannot thereby classify His body as nonhuman since, in that case, our very human bodies would be like that after the resurrection, too.
Usagi