In the Narrative, why was Douglass happy about Master Hugh's lack of religion?

I wouldn't say he was euphoric about Hugh's lack of religion, but he thought he was a wonderful man compared to his brother.

I went directly home, and told the story of my wrongs to Master Hugh; and I am happy to say of him, irreligious as he was, his conduct was heavenly, compared with that of his brother Thomas under similar circumstances.