it's just all a bunch of bullshit. they made a narrative and spiced it up with a story that has huge holes. truth is Isa (Jesus) was a buddhist and he presented his views in a manner they later twisted to make into their new religion to unite Romans around.
Crucifixion was not primarily an instrument of death. That death even happened was almost incidental. It was primarily an instrument of torture and public humiliation. It was designed to be the slowest and most painful and terrifying experience that could be imagined at the time. If a person could go through it and then be released just before death, it would still have been a sacrifice few humans would volunteer for as Jesus did in that story.
All that said... the meaning of that story is not to be found in a literal interpretation, as if it were history. It takes on a completely different, and quite rational, meaning when understood as mythology. The actors and actions in the story represent components of human psychology.