A group of Catholic and Anglican church leaders have accused the ... government of ''state-sanctioned child abuse'' in the immigration detention system, and called for Immigration Minister Scott Morrison to step down from his position as guardian for all unaccompanied minors. Leaders from nine Christian denominations, which form the Australian Churches Refugee Taskforce, [have released] a report [with] recommendations to the ... government to improve the wellbeing and treatment of children in onshore and offshore immigration detention centres. The church leaders ... say the church has learnt a painful lesson from decades of child abuse within their congregations. Reverend Peter Catt, the Anglican Dean of Brisbane said: ''We have the absolute duty to make sure the events that came out from the Royal Commission aren't repeated in any setting. Institutional child abuse occurs in many different settings and it's illegal, it's horrific and it's unacceptable.'' The recommendations in the report include ending closed detention for all unaccompanied children; providing institutional child welfare and protection; and replacing the Immigration Minister as the guardian of about 135 unaccompanied asylum seeker children who are being held in onshore and offshore centres. There are about 4330 children in immigration detention - most of them living in the community. ''The Minister forsakes his guardianship duties when he sends unaccompanied children to the detention camp in Nauru,'' says the report, titled Protecting the Lonely Children. The report said there was clear evidence that children are experiencing ''terrible physical and mental suffering''.