“This necessitated the first councils...the issues regarding the very core of Christian beliefs: the Holy Trinity and the Duality of Christ. And it was over these issues that the first schism occurred. Not over Mariology and her perpetual virginity found in the Protoevnagelium, or over the Apocrypha, or the Septuagint, but over the the nature of the Godhead and Christ.”
This is really an excellent point and as someone with a devotion to Panagia I never really thought about it but its demonstrably true. During the first 1000 years of The Church, there simply wasn’t any question about the Theotokos or her perpetual virginity or her dormition and the facts surrounding it or her childhood, the Annunciation, etc. as there certainly were questions on the nature of the Trinity and of Christ and later of the veneration of icons which necessitated Eumenical Councils. But no questions, no heresies, about the Theotokos. Interestingly, there are comments made in the 7th century work “The Spiritual Meadow” about the devotion of a certain heretical sect, the Severians, which had been around for sometime by then, to the Theotokos. It seems even a major heretical group had no problems with the Marian beliefs of The Church.
This is why hisotrical perspectives are so important, Kolo. The Bible and the Church must be seen in its historical context: our Divine Liturgy is of the same age the Church that presided over the canonization of the Bible. It tells us that what we believe is what the Church believed back then. We can say that with certainty. Other's can't.