The continuing investigation by Hills Police Area Command was confirmed as Swansea man Brett Sengstock, who was sexually abused by Houston from the age of seven, criticised Prime Minister Scott Morrison for his public support of Houston's son, Brian Houston.

Mr Sengstock was backed by Maitland Christian Church pastor Bob Cotton, who said Mr Morrison's prominent and continuing support for Brian Houston, despite the findings of a royal commission hearing into Hillsong, were a slap in the face for survivors on the eve of the first anniversary of the national apology.

On October 22, 2018 Mr Morrison apologised "to the whistleblowers who we did not listen to" and "the spouses, partners, wives, husbands, children, who have dealt with the consequences of the abuse, cover-ups and obstruction".

Mr Morrison's refusal to say if he sought to have Brian Houston attend a State dinner at the White House in September was deeply troubling, Mr Cotton said.

"After the royal commission the Hillsong Church allowed a false narrative to be maintained about what went on and that false narrative continues," Mr Cotton said.

"Brett Sengstock has bravely sought justice from Hillsong and been rejected. He said it 'beggars belief' that the Prime Minister can stand beside Brian Houston, given the way the church has treated Brett, and I can only agree."

The Royal Commission into Institutional Responses to Child Sexual Abuse held a public hearing into Hillsong and other Australian Christian Churches in October, 2014 and released a final report on the evangelical church group one year later.

The royal commission found Frank Houston was allowed to "publicly resign, without damage to his reputation or the reputation of Hillsong Church".

Brian Houston was head of the church in 1999 when allegations about Frank Houston's crimes against Mr Sengstock were first raised. The royal commission found Brian Houston had a conflict of interest when he dealt with the allegations, and failed to advise the church's national executive when he sent a cheque to Mr Sengstock for $10,000 after Frank Houston confirmed the abuse.

The royal commission also found Hillsong did not report allegations about Frank Houston to the Commission for Children and Young People, which wrote to the church in August, 2000 that "it is important to remember that any completed relevant disciplinary proceedings must be reported" to the commission, including matters from the previous five years.

The direction captured the Hillsong response to the allegations about Frank Houston.

In a statement to the Newcastle Herald a Hillsong spokesperson said Brian Houston was "desperately saddened by Brett's plight", but "at the time of Frank's tragic abuses of Brett Sengstock Hillsong Church was many years from being in existence".

The royal commission public hearing "did not directly involve Hillsong Church", the spokesperson said.

In a statement NSW Police Media said it would be making no further comment while the Hillsong investigation is ongoing.