“Your tradition is based on scripture...”
I, with all due respect, that’s simply ahistorical nonsense. Whether or not you believe the Holy Tradition about the Most Holy Theotokos is completely up to you. But history, I , is history. The men who decided what would make up the canon of the NT believed the report set out in the Synaxarion I quoted just as much as they believed in the Real Presence of Christ in the consecrated bread and wine on the altar tables, or the veneration of icons and relics, or the hierarchial nature of The Church or the “ortho-doxia” of the Divine Liturgy or any of hundreds of other Traditions handed down from Apostolic times. Don’t accept Holy Tradition if that’s what you want, but don’t delude yourself into believing that those Greek bishops who canonized the books of the NT allowed ANYTHING into their canonized scripture which conflicted with what they preserved as Holy Tradition. Nothing like that, I, made the “cut”; most especially don’t think that the NT created Holy Tradition. Its quite the opposite.
I agree with this. The part that makes me still Protestant, however, is this question: How do you determine what is valid "holy tradition"?
As a Protestant, I don't have an answer.