article of faith vs strong belief

article of faith and strong belief both are nouns.

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

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

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

Other synonyms of article of faith include conviction.

article of faith (noun)	strong belief (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