As a revert to Catholicism I had the opportunity to work in the spiritual guidance department of the Billy Graham Association both as a Protestant and then as a Catholic. Many many Protestants do not understand the name Theotokos, Mother of God. They could if they wanted to but alas many are content to be spoonfed their beliefs about Church and History by those believing that Real Church History begins with the Reformation. all the rest is to them error that began at the end of the Canon of Scripture (for those who don't know - That is what they called it when the Catholics compiled the books of the Bible).
So any theological jargon that was not picked up by the "reformers" is therefore ignored and called false. Little do they know that Theotokos fought off the heresy that Jesus was not both human AND divine. Or that most of what they believe as tenents of the faith was determined by the Catholics they consider heathen.
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How could you possibly have been a spiritual advisor as a Protestant and then as a Catholic???