Invalid question since it is your religion that teaches that salvation can be lost...
What I find interesting is that a Cardinal would show up to perform the Mass instead of just a lowly local priest...What's up with that???
My religion hold this teaching because it is fully Biblical.
Consider the parable of the Prodigal Son who had received his inheritance and squandered it in sin. Upon his repentance, he was joyously received back into the home of his father. He had lost his inheritance and regained it through repentance.
Or consider St. Paul’s warnings in Corinthians when he speaks of the Jews who were struck down in the desert after being saved from slavery by God, because they desired evil things even though they drank from the rock which was Christ.
Try again.