Why do Orthodox reject the idea that Saint Mary was immaculately conceived? What are the ramifications of this? Matthew P. and Craig Truglia compare and contrast the positions of both churches.
Orthodoxy versus Catholicism on Marian Doctrines
Why do Orthodox reject the idea that Saint Mary was immaculately conceived? What are the ramifications of this? Matthew P. and Craig Truglia compare and contrast the positions of both churches.
Orthodox Christian Theology 
I hope, if you haven’t already read it, you find this article by Fr. Lev Gillet to be quite fascinating 🙂
https://afkimel.wordpress.com/2015/09/01/the-immaculate-conception-and-the-orthodox-church/