suffix
Suffix attached to the name of a religion or religious founder to form the name of the religion or sect, e.g., キリスト教 (Christianity), 仏教 (Buddhism).
キリスト教は世界で最も信者の多い宗教の一つです。
Christianity is one of the religions with the largest number of followers in the world.
彼は仏教の教えに深く感銘を受けた。
He was deeply impressed by the teachings of Buddhism.