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J_Edwards said:
I agree. It has been said that a Christian can embrace some types of heresy and still be a true Christian, however an apostate, though they may embrace some parts of Christianity as true, cannot be Christian.

Where do we draw the lines ? How do we identify a true apostate?

Maybe when they can be shown that their views have been rejected by the Church for many years and they decide that this does not matter and still hold on to their views.