Gospel vs religious text

Gospel and religious text both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gospel	Yes	No	No	No
religious text	Yes	No	No	No

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

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

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

Gospel (noun)	religious text (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