名詞 catholicism:

1. the beliefs and practices of a Catholic Church
   同義詞：Catholicity

1. He has converted from Catholicism to Judaism.
   他已從天主教改信猶太教。
2. He's converted to Catholicism.
   他已皈依天主教。
3. My mother has converted to Catholicism.
   我母親已轉(zhuǎn)而信仰天主教。

Ca.thol.i.cism

n.（名詞）
The faith, doctrine, system, and practice of a Catholic church, especially the Roman Catholic Church.
天主教的信條：天主教堂，尤指羅馬天主教堂的信條、教義、體系和慣例