Would the fact that Superman is the “longest running fictional character ever” support or undermine my claim that he typically functions as an anti-Christ figure?

I should observe that God himself was considered and rejected for the appellation: “It should be noted, however, that those who would proffer the cheeky suggestion that Our Father Who Art in Heaven is a fictional character are godless heathens and/or Theology majors. Anyway: Troublemakers. Let us pay them no heed.”