A Muslim group has denounced Sydney residents for having sex before marriage and allowing children to attend mixed-gender schools.

The Sunni fundamentalist AlKauthar Institute has made a video, featuring a man in a grey hoodie, which portrays the New South Wales capital as 'Sin City galore'.

Standing near Circular Quay, he looks around to be confronted by the Arabic word for sin.

'You look left it's haram. You look right it's haram. You look ahead and it's haram,' the video says with subtitles.

'The solution? Lower your gaze, brother. Fear Allah.'

This man in a grey hoodie looks around only to be confronted by sin wherever he looks

Listing what it regards as sins, there is an image of a heterosexual couple with the subtitle: 'Sex before marriage.'

An image of primary school boys and girls follows, with the phrase: 'Mixed schools.'

The video starts with a montage of perceived sins, including a male model with the subtitle 'hypersexualised culture', to illustrate 'the challenges we face in this world as Muslims'.

A syringe filled with red liquid, to illustrate drugs, and a nightclub also feature on the screen to ask if Muslims can enjoy earthly pleasures, known by the Arabic term 'dunya'.

The man in the dark hoodies looks right as well only to see sin, also known as haram in Arabic

This couple is cited in the video as an example of sin if they have sex before marriage

The man in the video is advised to lower his gaze to avoid glimpsing sin all around him

'The evils of alcohol. Music? Let's not even go there,' a female voice-over says.

The two-minute video, to promote an upcoming conference at Rosehill in Sydney's west, asks if Muslims can enjoy earthly pleasures.

The Twins of Faith conference, marketed under the hashtag '#halalenjoyment', features burqa-wearing Muslim convert Umm Jamaal ud-Din who recently told women it was sinful for them to pluck their eyebrows.

Ironically, the September 24 event is being held at Rosehill Racecourse - a venue that promotes gambling, which is forbidden in Islam.

The end of the video features a red Ferrari outside a mansion to say Muslims are allowed to become millionaires.

'As a Muslim, you can have fun in this dunya. You can become rich,' it says.

'A halal millionaire perhaps. '