

That’s like saying “they’re not Catholic, so they’re not a real Christian.”
It’s reductive and not particularly helpful for categorization. Coptic christians, for example, are one of the most ancient sects and they use a different version of the creed that was clarified in 381 to remove “Macedonious’ heresy against the divinity of the Holy Spirit” and again in 431 to add an introduction.
So they don’t follow the Catholic and protestant creeds. Furthermore, most Christians couldn’t quote the thing if their life depended on it. Saying that one has to follow the creed to be a Christian makes no sense, especially when there are approximately 40 to 50 thousand discrete ways of being Christian.







In that case, why are protestents considered Christians when most of them also have a different Biblical cannon from the Catholic Church?
There’s no easy way to do it; I consider “Christian” the umbrella term for anyone who considers Jesus to be their savior, then get more specific about type from there.