What exactly is theosis?
Coming from a Protestant background, I've heard of the filioque argument, but I'm at a loss as to why (from a theological standpoint, leaving aside past strife) it would prevent communion. I don't really see why it can't be regarded as within of possibilities that individuals might have justifiably different opinions. I personally can see the logic of the filioque, it seems more reasonable and logical, though it might have been added in the wrong way.
What is the Orthodox view on Protestants? I'm curious especially about whether they think a liturgy should be required. Though I know some Protestant churches do it, I've never been to a liturgical service of any kind.
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"A dead thing can go with the stream, but only a living thing can go against it." --G. K. Chesterton