What things in general have been brought with time into the Eastern Orthodox Church that the mainstream protestant Christianity considers as not being able to be traced back to the times of the church of the first century?
To clarify, my question is about what kind of things the mainstream Protestantism sees as new in the today's Eastern Orthodox Church. We know, for example, that the "Sola Scriptura" principle that was put forth by the Protestants has been deemed as something new by both the Roman Catholic and the Eastern Orthodox Churches (meaning that originally there was no such thing as "Sola Scriptura" in the early Church of the time of the 12 apostles). So, my question is about some such "new" things (as Protestant would deem them) in the Eastern Orthodox Church today.