In addition to what Mandie has said, the Great Schism between East & West was in 1450, after the sack of Constantinople by the so-called "Crusaders". There were others before but they were semi-resolved. That date was the final break though. There was a period in Orthodoxy [Christian] when icons [Ikons] were not tolerated and burned. "Iconoclasm' I think it was called.
"Christlike Manner" is difficult to explain, but essentially, it means they bore their suffering [passion] with patience and forgiveness. No one, even movie makers could possibly know what their last thoughts were in that basement, but from all accounts I have read, they crossed themselves before the bullets. In that, they are honoured in icons as "passion bearers" NOT apolstolic saints. In both churches, dieing in the faith and going to the presence of god, makes one a saint [with a small "s'] All saints before 1450 are common to both churches, according to relevance.