Don't think catholics have that tradition, could be wrong but 40 days is all over the bible so it would seem that he would be religious in some way or another. I think him being a priest is very possible.

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\"We\'re not alone on this Island and we all KNOW IT\" - John Locke

Locke: Why do you find it so hard to believe?
Jack: Why do you find it so easy?
Locke: It\'s never been easy.