I came across this article by Bishop Hilarion Alfeyev today. It takes as its main point the interpretation of 1 Peter 3:18-21. I think it neatly encapsulates much of how East and West tend to think differently. While it mostly refers to Western Catholic tradition, Protestant (especially Reformed) teaching is much closer to Rome than Constantinople on the soteriological impact of this issue. I encourage you to read the whole article; what I could quote here doesn't capture its essence.
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