Gospels vs religious writing

Gospels and religious writing both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gospels	Yes	No	No	No
religious writing	Yes	No	No	No

As nouns, religious writing is a hypernym of Gospels; that is, religious writing is a word with a broader meaning than Gospels:

Gospels: the four books in the New Testament (Matthew, Mark, Luke, and John) that tell the story of Christ's life and teachings
religious writing: writing that is venerated for the worship of a deity

Other hypernyms of Gospels include religious text, sacred text, sacred writing.

Gospels (noun)	religious writing (noun)
the four books in the New Testament (Matthew, Mark, Luke, and John) that tell the story of Christ's life and teachings	writing that is venerated for the worship of a deity