Christianity doesn't know what the word resurrection even means.
Thesis: Christianity doesn't know what the word resurrection even means. Or fudges the definition as needed.
Exhibit A: Jesus' debate with the Sadducees on resurrection in Matt 22:23-33.
To the Sadducees question about who the woman who was married 7 times will be married to in the resurrection, Jesus answer is that scripture says we will become angels in the resurrection.
Glossing over the fact that no Old Testament scripture suggests anything like that so his claim that they didn't know this due to a lack of knowledge of scripture is false; his claim shows a lack of understanding what reurrection even means: becoming an angel is NOT resurrection.
Furthermore, his suggestion that God saying at the Burning Bush "I am the God of Abraham, Isaac, and Jacob" proves the resurrection (combined with what he just said about becoming angels in the resurrection), implies that he considers Abraham, Isaac, and Jacob to have already experienced the resurrection.
Exhibit B: The Christian belief that a few stories of appearances is enough to prove a resurrection.
Jesus' lack of understanding the word resurrection could explain why Christians have such a low evidence requirement for Jesus' resurrection: they don't know the meaning of the word. A resurrection means more than just a few guys saying they saw someone after death. After all, they could see his ghost or perhaps he became an angel. But a resurrection means bodily rising to live on earth again. But Jesus didn't do that. Per the stories he appeared a few time to a few people, then went to heaven, putatively to wait thousands of years and return. That's NOT resurrection. (Also, Elvis and 2Pak could be considered resurrected if it were!)
Resurrection is the physical arising of a dead body back to life, followed by living again on earth, thus the person is around as proof of their resurrection for as long as they continue to live. If one is resurrected to ultimately die again, they will live maybe a few more years or decades, and they are around as proof thereof (strangely in the story of Lazarus in John this is undertood); if one is resurrected to die no more, they will live forever, on earth, in a physical body, and thus be accessible to us as proof. But Christians don't see that connection and think Jesus turning into an angel, appearing 3 or 4 times, and then hiding out in heaven, constitutes a "resurrection." It does NOT! He is not risen; he is angelified (if anything).
This also explains why Christians see no problem with Jesus being a shape-shifter after the so-called "resurrection": appearing to Mary as the gardener, or to the two on the road to Emmaus "in another form": i.e. resurrection to them does NOT really mean resurrection but becoming an angel, something which is ultimately not subject to proof because its fully mystical and intangible, unlike a real resurrection which would be very physical.