PaxChristi2 says: 《Siscoe and Salza responded to your arguments and proved that the authors you referenced don't teach what you claim.
So, what did I claim? This: 《I have quoted verbatim Msgrs. Fenton and Van Noort, as well as Canon George Smith, who all explain that the "sin of heresy" separates one from membership in the body of the Church.
Now, here are the verbatim quotations:
The TEACHING of the CATHOLIC CHURCH - Canon George F. Smith, D.D., Ph.D. London, Second Edition, 1952 XX THE CHURCH ON EARTH — § VI : MEMBERSHIP 
«Pius XII has reaffirmed in the clearest language what are the conditions for membership of the Church. “Only those are to be accounted really members of the Church who have been regenerated in the waters of Baptism and profess the true faith, and have not cut themselves from the structure of the Body by their own unhappy act or been severed there from, for very grave crimes, by the legitimate authority.”» …  «Nevertheless the melancholy possibility must be envisaged of those who may have “cut themselves off from the structure of the Body by their own unhappy act or been severed there from, for very grave crimes, by the legitimate authority.” In other words, the Church, as being a perfectly constituted society, has the right for grave reasons of excluding from membership. She may pass sentence of, or lay down conditions which involve excommunication.» …  «Certain sins — viz., apostasy, heresy and schism [Can. 1325, § 2.] — of their nature cut off the guilty from the living Body of Christ. […] Heresy, objectively considered, is a doctrinal proposition which contradicts an article of faith; from the subjective point of view it may be defined as an error concerning the Catholic faith, freely and obstinately persisted in by a professing Christian.» […] «It can hardly be denied that those who take up any of these positions — [I.e. heresy, schism, or apostasy] … sever themselves by their own act from membership of the Church.»
Mons. Van Noort (quoted by Salza & Siscoe in their own book): “b. 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 that faith. Obviously, therefore, they lack one of three factors—baptism, profession of the same faith, union with the hierarchy—pointed out by Pius XII as requisite for membership in the Church. 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’.” (Dogmatic Theology, Volume II, Christ’s Church, p. 241-242.)
Salza & Siscoe quote Fenton (True or False Pope? p. 158):
« Fr. Fenton wrote: “In the encyclical, the Holy Father speaks of schism, heresy, and apostasy, as sins [admissum] which, of their own nature, separate a man from the Body of the Church. He thereby follows the traditional procedure adopted by St. Robert himself in his De Ecclesia Militante. The great Doctor of the Church devoted the fourth chapter of his book to a proof that [public] heretics and apostates are not members of the Church.” »
Now how can it be said that these authors did not teach what they explicitly assert, namely that the sin of heresy, by its own nature separates one from the body of the Church?