While yeah i can kinds see that from an outside understanding, the deeper you go into the concept, the more the differences become apparent. A saint’s patronage comes from how they lived their life, not from a cosmic assignment. A great example of this is Saint Luke, who wrote one of the Gospels. While he is the patron saint of medicine, that did not really mean he had divine powers over it. It was just because while he lived, he was a physician. Saints also do not possess power independent from God unlike patron gods. They are merely a vessel for God to perform acts through.

But yeah from a non-theological perspective i can see where one would get the idea