How Did We Get From Absolute Clarity to Open Dissent?

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"There are absolutely no grounds for considering homosexual unions to be in any way similar or even remotely analogous to God’s plan for marriage and family. Marriage is holy, while homosexual acts go against the natural moral law. Homosexual acts “close the sexual act to the gift of life. They do not proceed from a genuine affective and sexual complementarity. Under no circumstances can they be approved”. 

Congregation For The Doctrine of the Faith