You picked a pretty poor proof text for your purgatory...Judas there was praying for some dead folks whom God killed for refusing to repent from mortal sins who happened to be in hell...
Catholic doctrine says you can't pray dead people out of hell...Judas had good intentions but he was dead wrong...Just as wrong as the Catholic religion for trying to use that as a proof text of purgatory...
The common Catholic interpretation is that this was a superstitious practice, a venial sin, rather than the worship of a god, a mortal sin. It seems that it would have to be since Judas' practice of praying for the dead is commended:
"In doing this he acted in a very excellent and noble way, inasmuch as he had the resurrection of the dead in view; for if he were not expecting the dead to rise again, it would have been useless and foolish to pray for them in death. But if he did this with a view to the splendid reward that awaits those who had gone to rest in godliness, it was a holy and pious thought. Thus he made atonement for the dead that they might be freed from this sin" (2 Macc. 12:43...45)Catholic doctrine says you can't pray dead people out of hell...
That's correct. The Church teaches that Purgatory is a state of purification prior to entry into heaven.