original sin vs church doctrine

original sin and church doctrine both are nouns.

Word	Noun	Adjective	Verb	Adverb
original sin	Yes	No	No	No
church doctrine	Yes	No	No	No

As nouns, church doctrine is a hypernym of original sin; that is, church doctrine is a word with a broader meaning than original sin:

original sin: a sin said to be inherited by all descendants of Adam
church doctrine: the written body of teachings of a religious group that are generally accepted by that group

Other hypernyms of original sin include sin, sinning, creed, gospel, religious doctrine.

original sin (noun)	church doctrine (noun)
a sin said to be inherited by all descendants of Adam	the written body of teachings of a religious group that are generally accepted by that group