strong belief vs article of faith

strong belief and article of faith both are nouns.

Word	Noun	Adjective	Verb	Adverb
strong belief	Yes	No	No	No
article of faith	Yes	No	No	No

As nouns, strong belief and article of faith are synonyms defined as:

strong belief and article of faith: an unshakable belief in something without need for proof or evidence

Other synonyms of strong belief include conviction.

strong belief (noun)	article of faith (noun)
an unshakable belief in something without need for proof or evidence	an unshakable belief in something without need for proof or evidence
	(Christianity) any of the sections into which a creed or other statement of doctrine is divided