A Sydney Muslim psychologist and ABC religion contributor writer has called on her 'brothers and sisters in Islam' to keep reproducing so their religion can one day overtake Christianity.

Hanan Dover made the seemingly tongue-in-cheek comments on Facebook next to a story predicting that Islam will surpass Christianity to become the most popular religion in the world by 2070 - along with the hashtag #creepingsharia.

The Pew Research Centre, based in Washington DC, this week released research forecasting Islam's share of the the world's population will equal the Christian share - at roughly 32 per cent in 53 years' time.

Sydney Muslim psychologist Hanan Dover encouraged Muslims on Facebook to reproduce

Hanan Dover's Facebook post says Muslims should 'exercise our Weapons of Mass Reproduction'

Ms Dover, who works as a psychologist at Bankstown in Sydney's south-west and is a court-appointed psychologist for terror suspects, posted a Facebook message about those findings.

'Dear brothers and sisters in Islam,' she wrote.

'We need not do anything except exercise our Weapons of Mass Reproduction.

'The most non-violent approach of taking over the No. 1 spot through love making.'

Hanan Dover said Islam could become the world's No. 1 religion 'through love making'

Next to the word 'takbir', which an Arabic Islamic term for 'God is the greatest', she included the hashtag: 'creepingsharia'.

Ms Dover is the founder of the Mission of Hope charity for Muslims and runs eight psychology practices in Sydney, known as Psych Central.

She is also a controversial figure.

The Australian Federal Police last year alleged she knew of plans by Islamist sympathisers to leave Australia and fight with Islamic State but she had said nothing, the Herald Sun reported in September 2016. Ms Dover denied the allegations.

Hanan Dover told a forum at the University of Western Sydney in 2002 that homosexuality was forbidden in Islam

The psychologist says Lebanese Muslim GP Jamal Rifi has 'zero expertise in radicalisation'

The court-appointed psychologist slammed Lebanese Muslim GP Dr Jamal Rifi who is praised by both sides of politics for his work tackling radicalisation

The psychologist has a history of attacking secular Muslims in Facebook posts.

She has previously slammed Sydney-based Lebanese Muslim GP Dr Jamal Rifi, who has been praised by both sides of politics for his work to tackle Islamic radicalisation.

'For crying out loud a million times, Dr Jamal Rifi who has zero expertise in radicalisation and extremism should not be given air time,' she said on Facebook in October 2015, after he received an honorary doctorate from the University of Canberra.

'Since when do radicalised youth, whatever that is supposed to mean, need medical doctors?

'Far out. Only a narcissistic type chameleon will try their very best to keep themselves relevant. He is the perfect example.'

This was also in the days after 15-year-old schoolboy Farhad Jabar shot dead accountant and father-of-two Curtis Cheng outside the New South Wales Police headquarters at Parramatta, in Sydney's west.

Hanan Dover in October 2015 accused A Current Affair host Tracy Grimshaw of doing a journalistic beat-up about the Parramatta shooting

The psychologist also accused A Current Affair of misreporting the Parramatta shooting in October 2015

In another post, Hanan Dover described A Current Affair as 'racist journalistic vomit'

Ms Dover, who has written opinion pieces for the ABC's Religion and Ethics website, attacked A Current Affair host Tracy Grimshaw during that same week.

She had objected to an initial Nine Network report which said the gunman was of Middle Eastern appearance, even though the killer, who police shot dead, was born in Iran.

'This is the level of racist moronic journalist beat-up that we have to live with,' she said on Facebook.

'Tracy is not "possibly" a moron, she is one.'

She added A Current Affair was 'racist journalistic vomit' in another Facebook post from October 2015.

Farhad Jabar was 15 when he shot dead accountant Curtis Cheng outside the New South Wales police headquarters at Parramatta, in October 2015

The psychologist said one of her colleagues knew Farhad Jabar, before he shot dead an accountant in Parramatta

During that same week, she published another Facebook post which said a colleague of hers knew Farhad shortly before he was shot dead.

'My community colleague is the person who had close contact with him before his death,' she said.

In 2002, she told a forum at the University of Western Sydney's Bankstown campus that homosexuality was forbidden, or haram, under Islamic law.

'If Allah loves homosexuals, he will also loves thieves, murderers, liars, hypocrites, criminals,' she said.

'How can Allah accept a behaviour that he has told us is not permissible?'

'Did Allah make a mistake and say that homosexuality is haram for about 1400 hundred years and when humans are ready, they can start disobeying my laws, being a progressive civilisation, and I will start accepting all evils? C'mon.'

Despite that, she signed a media statement with other Islamic community leaders in June 2016 expressing sympathy for the 49 people killed at the Pulse gay nightclub in Orlando, Florida.