I do not believe that the physical body of Jesus was resurrected and neither did Paul believe that. Paul believed in a spiritual resurrection. I believe that Christians got off the wrong track because of what Luke said about touching Jesus and saying he had flesh and bones. I believe that the gospels that were written later were just stories, nothing that ever occurred in real life. I am sure you know that Luke was not written by Luke the apostle, it was written by a man who write what had been passed down to him by way of oral tradition, and Christians believed it because that is what the Church taught, which was passed down through the generations.
You said:
“But just because He had a body that had "flesh and bones" (which He specifically pointed out to His Apostles), that body was not a mortal body. It was no longer subject to disease, deformity, or death.” The problem with that belief is that flesh and bones are mortal and mortal means subject to physical death. Mortal bodies are also subject to disease and deformity because they are made of physical elements that can cause disease, and all mortal bodies will die eventually. Only the soul is immortal.
I know of no scriptures that say that the bodies we have in heaven will be corporeal but not mortal.
Corporeal describes something that has a physical form. It is the opposite of spiritual or emotional. Something that is
corporeal exists in the real world. It's sort of a fancy way of saying bodily or physical.
corporeal - Dictionary Definition : Vocabulary.com
There is no such thing as a physical body that is immortal because no physical body lives forever. Paul said we would be raised in a spiritual body and Paul differentiated physical bodies from spiritual bodies. A spiritual body is not physical. Nowhere in the Bible does it say that there is a physical body that is immortal (can live forever).
1 Corinthians 15:50 What I am saying, dear brothers and sisters, is that our physical bodies cannot inherit the Kingdom of God. These dying bodies cannot inherit what will last forever.
51 But let me reveal to you a wonderful secret. We will not all die, but we will all be transformed!
54 Then, when our dying bodies have been transformed into bodies that will never die,[c] this Scripture will be fulfilled: “Death is swallowed up in victory.[d]
You said: “
It was physical in the respect that it was corporeal; it had a physical form and could be touched and felt. It was no longer sustained by the life-giving blood that a mortal body needs to survive. Instead, it was sustained solely by spirit.” The problem with what you said is that it is not in the Bible so that means it is a doctrine the Church made up by reading verses and putting them together with other verses and making assumptions about what they mean.
I think the reason Christians believe what they do about having a physical body like they do now, one that can never die, is because they believe Jesus was raised in such a body, and also because they want such a body, so they are attached to the idea of having a body like the one they have that can do all the things it does now but never get sick or die, but
that is not in the Bible and it cannot be supported by what is in the Bible. Moreover, heaven is not physical in any way; it is a purely spiritual dimension, so there will not be eating and drinking and having sex. Those days are over after we die physically. Some people do not want to face that fact but they will have to face it after they die, so I think it is best that they come to terms with it before they die since that will make the transition a lot easier.