Most people think "Pope" is a Catholic title too, but Discordians believe all people (not even just Discordians) are Popes, and the crossover means that members of the Church of the SubGenius often acknowledge such Popes too.

Anyway, Catholicism is a lot bigger than the Roman Catholic Church. You have other very explicitly Catholic churches such as the Eastern Orthodox Church, and you also have faiths like Anglicanism, which are a weird hybrid where most (Roman) Catholics would consider them protestant, but they refer to themselves internally as a "Holy Catholic church", they have Bishops too (but no Pope, their spiritual head is for historical reasons the Queen of England) and so on.