capitalization of languages, nationalities, and religions
Words for peoples, tongues, and faiths.
Capitalize names of languages, nationalities, and religions: English, French, Japanese, Catholic, Islam, Jewish. Lowercase god only when it is not the name of a particular deity. Lowercase biblical and catholic when catholic means universal, not the church.
Examples
Use She speaks Spanish.
Use He is Catholic.
Use a catholic taste in music
Avoid She speaks spanish.