Odd that no Christian believed that for the first 1500 years plus of The Church's existence and only a very small minority, a minority outside The Church, believes that today. Am I to conclude that the HS has done a singularly lousy job of protecting The Church from heresy, fwd?
In any event, here is the dogma, proclaimed in 433:
"We profess therefore that Our Lord Jesus Christ, the only Son of God, is true God and true man, constituted by a body and a rational soul: that He was engendered by the Father before all time as to His divinity, and as to His humanity, was born of the Virgin Mary in time for us and for our salvation; that He is consubstantial with the Father in His divinity, and consubstantial with us in His humanity; for one union was effected by the two natures, and we acknowledge only one Christ, one Son, one Lord. Because of this union, which is free from all admixture, we also acknowledge that the Blessed Virgin is the Mother of God {Theotokos}, because God the Word was made flesh, was made man, coalesced with the Temple (His humanity), which He took from Her."
The Church and The Fathers of the Council of Ephesus were quite aware of scripture.
The fact that heresy has plagued the “Church” is only too obvious to need explanation or example, and the Holy Spirit cannot be left holding the bag. He has preserved truth, even if it seemed a small spark in times of almost universal darkness, in the most unlikely places and among the most unlikely people, not always of the “Church” properly, but of the Church spiritually. Mankind is exceedingly capable of extrapolating sound doctrine into the most heinous error, even by many of those that you venerate as Church Fathers.
And no, the Church (those universally united to Christ by the Holy Spirit through faith) does not believe that Christ proceeds from Mary, continues to proceed from Mary, and is contained, supported by, and is conveyed to men through the conduit of Mary, as your doctrine and your artwork depict.