David Lewis revisits the argument that Jesus either did not exist or was a minor figure that didn’t exist at the time that Christians celebrate.
If Jesus hadn’t existed would it matter. If Pope Leo X said, "It was well known how profitable this fable of Christ has been to us.” would this mean that the non-existence of Jesus would make little difference to the religion built around this figure, real or mythical. The Gnostics didn’t seem to have a problem with him not existing. On the other hand where are the Gnostics today.
Or, as the resurrection needs to be a verifiable historical event, which distinguishes Christianity from all other religions, would substantial evidence that Jesus was made up deliver a killer blow to Christianity.
Or considering Christianity’s ability to adjust and claim credit for all, including a universe that supports our kind of life, would it just meander on through time. I would be interested to see how it could respond to infinite other universes with different physics. Whether the existence of universes in which there was no life would be claimed as being there for us to explore also. Or where would Christianity stand on other sentient intelligent life in this universe that was not like us and had no religion. Would they be simply consigned to hell with the explanation that they existed in order that we may explore them?