I think if you just right pope by itself, not followed by a name, you don't capitalize. Example: "The pope is travelling all week."
Whereas, you would capitalize it if it had his name after pope. Example: Muslims would love to slip Pope Benedict's throat."
Another example would be "The responding unit was Officer Johnson." and "The officer responded to the 911 call."
I reserve the right to be wrong.
You are write.....
If you are referring to a specific pope, as in "The Pope bought a hotdog," the it is a proper noun, and it is Capitalized. If you are talking about about popes in general, "No pope has invoked infallability in the last half century," then you are correct: no capitalization.