Aspects of secular subjects such as history and geography were introduced only when relevant to religious studies and boys did not achieve any recognised qualifications at school.
Parents were “highly supportive” of the school’s education, Ofsted said, but inspectors were unable to speak with pupils “because their parents had withdrawn consent”.
The school’s leaders had not encouraged pupils to respect all people protected under the Equality Act, “such as in relation to their sexual orientation or gender reassignment”, or promoted understanding of other faiths and beliefs.