What exactly does Orthodox Christianity understand is happening at the crucifixion regarding the incarnation and death of the Son of God? How can a timeless being die, etc.?

Why is the Last Supper/Eucharist associated with Passover and not Yom Kippur?

I don't understand how there could be an original group of Christians without an individual who prompted all of the enthusiasm about him being the Messiah in the first place. In other words, how did this concept (i.e. that Jesus - who had not liberated the Jews and had been killed by the Romans - was the Messiah) become so proliferated that there were numerous (and very different) ideas about who he was without an historical figure to inspire it all?

How did you apply Wrede’s “Messianic Secret” theory to Jesus Mythicism? Also, what might lead to the conclusion that Jesus was a revolutionary?