Gordon Brown's new minister for race relations has attacked sharia courts, insisting that the Muslim community in Britain is not “advanced” enough to have its own legal system.

Sadiq Khan, whose comments will have added impact because he is a Muslim himself, has also warned that the growing number of tribunals based on Islamic codes could entrench discrimination against women.

Khan, who became minister for community cohesion in the government reshuffle this month, said: “The burden is on those who want to open up these courts to persuade us why they should do it.”

His comments contrast with those of figures such as Lord Phillips, the lord chief justice, who said in July that Islamic law could be used to settle marital and financial disputes.

Rowan Williams, the Archbishop of Canterbury, has said the establishment of sharia courts in the future “seems unavoidable” in Britain.

In a wide-ranging interview on race and immigration, Khan, 38, the Labour MP for Tooting, south London, also: Warned that an economic downturn could fuel ethnic tensions. Demanded an increase in benefits for immigrants with larger families. Admitted that government anti-terror laws had caused “problems” in race relations. Called on public bodies to cut translation services to encourage immigrants to learn English.

Khan’s outspoken remarks on sharia courts are likely to cause the most controversy.

The Sunday Times last month revealed that the government had quietly sanctioned a network of sharia judges, empowering them to issue legally binding rulings on disputes including finance, divorce, inheritance and domestic violence.

Supporters of sharia courts point to the “beth din” courts long used by the Jewish community to resolve family disputes. However, Khan said sharia courts could not be compared with the beth din.

“I have seen good examples of Jewish courts,” he said. “I would be very concerned about sharia courts applying in the UK. I don’t think there is that level of sophistication that there is in Jewish law.

“Jewish law has a long history. There are not the same areas of concern that there are with sharia law. At some stage in the future I do not rule out the possibility that the Muslim diaspora in this country may be advanced enough. But now is not the right time.”

Khan said he was aware such blunt criticism of his own community would lead to controversy, but he insisted: “Mass migration [among Asian Muslims] started 30 years ago. Jewish migration started 500 years ago.

“It sends the wrong message at a time when I am trying to say to all citizens, ‘learn English, get involved in your community’.

“You should practise your faith, eat halal food, fast, have planning permission for a mosque, be buried in the Islamic way, you can have your son circumcised. What is the purpose – what is the loophole that sharia courts are closing?”

Khan said he believed the tribunals would only exacerbate the unfair treatment of Muslim women.

“There is unequal bargaining power between men and women in this country,” he said. “Women can be abused and persuaded to do things that they shouldn’t have to do.”

Until now, Khan, formerly a human rights lawyer, has perhaps been best known as the MP who was bugged by the police when he visited a constituent in prison.

He told how the incident, first reported by The Sunday Times in February, led to arguments with Muslim friends. “People said: ‘You have been lecturing us and even you are being bugged. What chance have we got?’”

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