T**he Orthodox do not believe that the Most Holy Virgin was free of original sin, and some still argue about her struggle to successfully resist sin whilst she was a mortal upon the earth.
However, the successful struggle against “sin” does not have anything to do with an “immaculate conception” - which would have made this effort unnessecary.
We EO believe that the Most Holy Virgin was mortal, and suffered as all mortals do - from the wages of original sin, and perhaps, but not conclusively, sinned during her life time.
Successful resistance of sin means that one is still suseptible to sin… and must resist it.
The “immaculate conception” dogma is totally foreign to the early Church.**
Though I won’t argue about what the Holy Orthodox believe, I DO want to clarify that the Catholic dogma of the Immaculate Conception simply refers to Original Sin, not to the subsequent battle against sinning. We DO additionally believe she did not sin throughout her life, but this was by choice, so that she has merit for this. The Immaculate Conception part, she has NO merit for, since it was a special GRACE given to her by God because of His Plan of salvation through her, if she accepted. And, IC simply argues that Mary had no ‘stain’ in her spirit due to Original Sin. It doesn’t even say that she was in NO WAY whatsoever part of that intrinsically human issue, but that it didn’t ‘STAIN’ her…whatever that means! It is seen as a necessity to have received this grace in order to ‘encompass’ God within her as the 2nd Person.
In terms of the Orthodox, I read a truly beautiful part of the Liturgy used during the celebration of the Dormition, that specifically refers to special graces conferred on St. Anne while she conceived Mary, to prepare her for God’ Plan. It sounds like IC to me! without making it a dogma.
Maybe there was no need in the East to make obvious things a dogma, because no one was arguing them. While in the West, due to the Reformers some of them at least - who aggressively attacked pretty much everything about Mary - declaring some truths all Christians held as dear until that time, was a necessity to preserve the tradition intact.
Just look at Orthodox Icons of Our Lady, or listen/read the Liturgical teachings about her, and compare with the Marian ‘dogmas’ to see the similarities. Maybe if the dogmas had not been proclaimed, we -in the West- may not have so much in common with the Eastern churches today! Just saying…