religious belief vs Greek Orthodox

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

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

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

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