I would only say that A Christian doctrine is what the entire Bible has to say on one particular subject.How to make religious doctrine:
1. Read the Bible.
2. Develop an opinion about a religious subject.
3. Collect all the texts in the Bible that support your opinion. Catalogue these as your "Proof Texts".
4. Collect all the texts in the Bible the refute your opinion. Catalogue these as your "Problem Texts".
5. Create viable explanations/rationalizations "proving" that the "problem Texts":
5a. Don't really mean what they say
5b. Were for "them" specifically, and were never intended for "us" in 2021
5c. Were later inclusions to the Biblical text, and therefore aren't authoritative
5d. Are no longer required in the church (generally related to the definition of "that Perfect")
5e. Are symbolic in nature, and therefore not something to understood as "Literal".
6. When you have accomplished the first 5 steps, publish a Theological book, presenting your Opinion, using your "Proof Texts" to Support / "Prove" your opinion. INCLUDING sections presenting your "Viable explanations" for any and all "Problem Texts", that will be raised as "Criticisms" of your opinion by folks with a DIFFERENT OPINION.
7. if your presentation is convincing enough, then start a denomination incorporating your opinion(s).
SImple as that.
Oh - and if your opinion changes, then just swap the Catalogues, and teach the opposite -
I think it is key to understand that the word “doctrine” is used interchangeably with the word “theology.” While this is not necessarily wrong, there is a difference between the two terms. Theology, or Christian theology, is the more general term. It refers to the study of the God of the Bible. Doctrine refers to the specific teachings about God that are found in a study of theology such as the “doctrine” of salvation or the “doctrine” of the afterlife.
Christian doctrine consists of the teachings of Jesus Christ, as found in the four gospels, as well as the teachings about Jesus Christ, which are found in the remainder of the New Testament and those teachings can not come from the hearts of men.
Now everything revolves around this precept........When we get our doctrine right, then all other things will fall into place. On the other hand, if we get our doctrine wrong, then our lives will be affected in a negative way. Therefore, I cannot overemphasize the importance of right belief because this should lead to right living.