How would you characterize Antonio's own religious beliefs in Bless Me, Ultima?
Antonio is still discovering his religious beliefs because he is being pulled in two opposing directions (Catholicism and the magic of Ultima) and trying to reconcile the two. One of Antonio's most admirable traits is his ability to question everything.
He is dutiful in his faith to the Catholic church, and his mother in convinced he will become a priest, as are many of his schoolmates. But we also know that he is trying to figure out some of its teachings and how those teachings apply to what he is seeing around him. For example, he wonders why Tenorio goes unpunished by God, even though he is a bad man.
He is drawn to Ultima and the magic she performs. He learns as much as he can, almost like an apprentice. He wants to know about nature, how plants can heal, what happens to our spirits after we die, and so on.
Because these two different belief systems are so at odds, he is still conflicted about what he believes and is trying to figure it out by questioning both faiths.