“Who determines that these missionaries know what is in the Bible and will not teach things that are not in the Bible, like praising the Blessed Mary?
On this thread, we have disagreements about what can be implied about Rev 22.”
Well, that’s probably a task for the Holy Spirit, don’t you think?
What is your point in this exercise? If you don’t think the Bible is enough, then what is your alternative? A magisterium that is just as fallible as the missionaries, but whose errors are set in stone and universal?
“No, I am referring to the fact that for the majority of Christianity, electricity was not a commodity and so the proposed solution would not convert the Germanic Tribes.”
Ah, then maybe you should have posed your question in the past tense instead of the current.