Why is Master Hugh's conversion to Christianity a deeply ironic event, in Douglass's eyes?

AHugh spends hours each day praying so that he becomes known among his friends as a model of piety.

BHugh invites preachers to stay at his house and has his slaves wait on them.

CRather than agreeing that his slaves should learn to read so that they can read scripture, Hugh tells his wife not to teach Douglass to read.

DRather than being moved by Christian teachings to kindness and mercy, Hugh uses religion to justify his actions against his slaves.