“Public heretics (and a fortiori, apostates) are not members of the Church. They are not members because they separate themselves from the unity of Catholic faith and from the external profession of the faith. Obviously, therefore, they lack one of the three factors-baptism, profession of the same faith, union with the hierarchy-pointed out by Pius XII as requisite for membership in the Church (see above, p. 238). The same pontiff has explicitly pointed out that, unlike other sins, heresy, schism, and apostasy, automatically sever a man from the Church. ‘For not every sin, however grave and enormous it be, is such as to sever a man automatically from the Body of the Church, as does schism or heresy or apostasy‘ (MCC 30, italics ours).”
(Monsignor G. Van Noort, S.T.D., Dogmatic Theology, Volume II, Christ’s Church, 153)
Did you read that, my friends? Heresy automatically severs a man from the Church. It is not the judgement of the Church that separates a heretic from the Church. This flies in the face of those who hold (heretically by the way) that one is separated from the Church for heresy only when the Church makes that judgement and not beforehand.