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From post #17:paul c
It is heresy if you are a Catholic and oppose Church teaching
“The CCC #88 (1997) clearly combines exactly with Pope John Paul’s Motu Proprio (= on his own authority) Apostolic Letter Ad Tuendam Fidem, 1998 (ATF), which requires the assent of divine and Catholic faith to believe (credenda sunt) dogmas (a category one truth). (Canon #750.1).”
Therefore, it is heresy ONLY if a person dissents from dogma, not infallible doctrine which belongs to category two – to be firmly embraced and held; nor to category 3 which is non-infallible doctrine – the category 3 truths are non-definitive (non-infallible) and require intellectual assent (“loyal submission of the will and intellect”, Lumen Gentium 25), not an assent of faith.