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Yes, someone who disagrees with the Church’s position on contraception, that is the Lord God’s position, is a heretic.
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No, no, no! Heresy is rejection or obstinate doubt regarding an article of faith, and rejection of contraception is not an article of faith. It is directly derived from doctrine, and thus its denial may be styled “sententia haeresi proxima,” or “an opinion approaching heresy.” But it is NOT heresy, and does NOT warrant excommunication.