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In page Lumen gentium:

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Certain Traditionalist Catholic groups, particularly Sedevacantists, consider Lumen gentium to be the demarcation of when the Roman Church fell into heresy,[1] pointing to the use of "subsistit in" rather than "est" as an abdication of the Church's historic (and to them compulsory) identification of itself alone as God's church.[citation needed] In an interview with the Frankfurter Allgemeine Zeitung, Cardinal Joseph Ratzinger responded to this criticism:[2]