He brought up religion; he had pre-printed some scriptures to back up his argument that she was displeasing to God and morally corrupt. Also told her she was going to suffer in her afterlife.
She may have responded to him, but he 100% brought religion into the conversation. By phrasing it the way he did, he was trying to slough off responsibility.
Apparently other students have come forward to say this is NOT the first time he’s used his religious beliefs to discipline.