sins most grievous

Which sins are the worst sins? The deadliest? Murder? Genocide? Oh, no. According to the Vatican's The Apostolic Penitentiary, "abusing the confidentiality of the confessional by revealing the nature of the sin and the person who admitted to it" is a far worse sin than murder or genocide, forgivable only by the Pope himself. And, of course, defiling the Eucharist is considered a "sin of extreme gravity."

Let me translate this for you: a priest who hears a confession of continuing child abuse and does the right thing by reporting this crime to the authorities is a far worse sinner than a serial killer. A professor who defiles a "sacred" cracker (alongside symbols of other religions and unreligions) is a greater threat to humanity than those responsible for the genocides in Rwanda, Darfur, Bosnia, Nazi Germany and so forth.

A person who uses common sense and reasoning is more of a religious criminal than a person responsible for hundreds or thousands of gruesome brutal deaths. And people wonder why I'm not religious!