“religion” in Japanese is 宗, read shuu, sou (しゅう, そう). It is a Grade 6 Kyōiku kanji, taught in year 6 of Japanese elementary school, and appears in words such as 宗教 (religion).
What does 宗 mean?
宗教について学ぶ。
Same sound, different character — the classic trap. Compare them side by side: