Gyro's right - the term "Immaculate Conception" specifically refers to the conception of Mary; Jesus' divine conception, even if it was immaculately concieved or however you want to describe it, is not officially referred to as "the Immaculate Conception". So yeah, he was being a pedant, even if he spelled it wrong.

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"This will not stand, ya know, this aggression will not stand, man." - The Dude