Just jotting down thoughts here for lack of a better place to put them. Recently there was a bit of a kerfuffle in certain Protestant circles when Hank Hanegraaff (I’d never heard of him, but he is or was a major player in American Protestantism, apparently) converted to my own faith, Eastern Orthodoxy. The general response of Protestants was that he had “left Christianity,” and there’s been a lot of back-and-forth about incense and idolatry and whatnot.
Most of this is tiresome and impossible to resolve because of Protestants’ and Orthodox Christians’ radically different beliefs concerning the ultimate source of “authority” for Christians. I’m not going to go into the sola this-and-that rabbit hole. However, the concept of “penal substitution” did get brought up, and that seems worth discussion.