'It's child abuse': Activist calls for Sydney's Islamic schools to be shut down

A prominent anti-radical Islamic commentator says Islamic schools in Sydney need to be shut down or Australia risks children being indoctrinated in extremism.

Somali-born former Dutch politician Ayaan Hirsi Ali accused Prime Minister Malcolm Turnbull of being weak on Islamic fundamentalism.

The anti-genital mutilation activist said the PM risked pushing Australians into other radical fringe groups like One Nation.

"I think the Australian government is not very different from other liberal governments," she told the Daily Telegraph.

"The Government just wants to be fair but in attempting to do so they end up ignoring the problem fermenting under the surface.

Ms Hirsi Ali is outraged by Islamic schools censoring science curriculum and banning art and music classes.

“It is child abuse pure and simple," she said.

"Muslim schools should not be allowed in liberal society.”

The prominent anti-Islam commentator, who travels with a permanent security detail out of fear of being killed by terrorists, said politicians "should stop insulting the intelligence of the public by going around saying Islam is a religion of peace".

The warning comes after 7 News revealed that a Sydney Islamic cleric defended calls to execute former Muslims.

Leader of the fundamentalist group Hizb ut-Tahrir, Uthman Badar, stood by a passage in the Koran about executing apostates while speaking to an audience in the Bankstown library on Saturday.

"In Islam is clear that apostates do attract capital punishment, we don't shy away from that," he said.

The declaration has led to calls for the group to be banned, as it has been in numerous countries in Europe and Asia.

There were numerous children in the audience when the cleric defended the position.

"There's no excuse in democracies to be even suggesting this as a hypothetical possibility,” said Professor Greg Barton of Deakin University.

A spokesperson for Justice Minister Michael Keenan told 7 News that the Government condemns language that incites or condones violence, saying that is not free speech.

Mr Keenan has referred the matter to the AFP to investigate whether they were encouraging violence and this group could now be banned.