In a comment to an answer on my question, Maiwa noted that
[particular theology] is not always a part of core doctrines of any denomination. It's about what the majority of the denomination believe
So when asking questions of the form "Is X practiced by any denominations/'mainline' denominations" or similar questions, should we differentiate between core doctrines and common practices?
(I considered rephrasing and asking on the main site, but I figured it fit better here)