While both are from the origin of the Christian religion, there are many different variables between the two sects. These include the authority of the church. The Protestants believe that the divine power only comes from all the books of the Bible alone. On the other hand, the Orthodox Christians consider the church's holy tradition to be divinely inspired along with the Bible. The orthodox believe that Mary was a virgin, and she was adored. However, unlike the Catholics, the Orthodox denounce this point of view, and they do not believe that the Immaculate Conception happened.
On the other hand, the Protestants consider Mary to be a holy woman, but they do not believe that she was a virgin. The Orthodox associate with the notion of exaltation by salvation, and they believe that salvation is a process through which a man's body and soul are exalted, and it occurs on the last day.
They argue that salvation is available to all people, and we can potentially demonstrate signs of spiritual harmony with the Holy Trinity. The Orthodox acknowledge the existence of the phase between life and the afterlife. However, the Protestants do not believe that there is a phase between earth and heaven.