IV. The Manichæans, by rejecting the Incarnation, have fallen into terrible iniquities
In this mystery, dear beloved, the mad error of the Manichæans has no part, nor have they any partnership in the regeneration of Christ, who say that He was corporeally born of the Virgin Mary: so that, as they do not believe in His real nativity, they do not accept His real passion either; and, not acknowledging Him really buried, they reject His genuine resurrection. For, having entered on the perilous path of their abominable dogma, where all is dark and slippery, they rush into the abyss of death over the precipice of falsehood, and find no sure ground on which to rest; because, besides all their other diabolical enormities, on the very chief feast of Christ's worship, as their latest confession has made manifest, they revel in bodily as well as mental pollution, losing their own modesty as well as the purity of their Faith; so that they are found to be as filthy in their rites as they are blasphemers in their doctrines.
Source: Sermons (New Advent)