Above all, a person who wants to become a saint must eat food containing gluten.  

Rules from the bible are not equally important.  In the middle of the 10 Commandments there is a commandment saying that it is illegal to mage pictures of anything in the heaven or on the earth, but nobody cares about that.  Also people have stopped caring about the biblical death sentence for working 7 days per week.  

It is very practical that the pope and the Christians can forget about the bible and instead make their own rules.  That makes the pope stand above god.  That must be fun for him.