The phrase "doctrinal about" is correct and can be used in written English.
It means to base one's beliefs or actions on a set of doctrines or principles. Example: The politician's speech was very doctrinal about the importance of following the nation's founding principles.
But there was nothing settled or doctrinal about his God.
You'll find another church that is doctrinal about something completely different.
Hence the reason for the otherwise puzzlingly harsh reactions of Chan masters to the earnest strivings of their students to reach Enlightenment (Yi Xuan, d. 866, The Recorded Conversations of Linji Yi Xuan) especially if such strivings have any tinge of the academic or doctrinal about them (Huang Po, d. 850, The Transmission of Mind).
"I think we should be more open about this without necessarily falling into a kind of doctrinal discussion about what the sources of that spirituality are.
Professor Beisner said that many churches have given up on the hard doctrinal discussions about the human relationship to God, pushing instead a more practical message about ethical behavior and responsibility.
Her beliefs are "not doctrinal" but about the way people should behave toward one another, she adds.
The story concerns a doctrinal disagreement about whether 11 or 12 prayers need to be said before a blessing.
In the end I told them that, God willing, we should concentrate our efforts on eliminating bigger evils – America, Israel, music – and leave smaller doctrinal questions about household appliances to one side for now.
Flavius Josephus, the Jewish historian of the 1st century ad, recorded in Bellum Judaicum (History of the Jewish War) how doctrinal disputes about death, the existence of an afterlife, and the "fate of the soul" were embodied in the views of various factions.
The movie is filled with Jewish riffs and Jewish jokes, as well as several splendid doctrinal disputations about Allen's main eternal obsession, death, and a twist on the Christian conversion from "Hannah and Her Sisters" that looks comically at a terrifying turn of events.
Forgoing hair-splitting doctrinal debates about congressional and executive claims to primacy in foreign affairs, Yoo tells the two branches to duke it out politically, deploying their allocated powers to reach a political equilibrium.
