Greek Orthodox vs religious belief

Greek Orthodox is not a noun while religious belief is a noun.

Word	Noun	Adjective	Verb	Adverb
Greek Orthodox	No	Yes	No	No
religious belief	Yes	No	No	No

Greek Orthodox (noun)	religious belief (noun)
	a strong belief in a supernatural power or powers that control human destiny

Greek Orthodox (adjective)	religious belief (adjective)
of or relating to or characteristic of the Eastern Orthodox Church