A senior Church of England clergyman called today for the resignation of the Archbishop of Canterbury, Dr Rowan Williams, over his remarks supporting Sharia in England.

The call, from a long-standing member of the Church's governing body, the General Synod, demonstrated the strength of the backlash Dr Williams that faces from within his own Church — as well as from political and other faith leaders.

The senior Synod member, who insisted on remaining anonymous, told The Times: "A lot of people will now have lost confidence in him. I am just so shocked, and cannot believe a man of his intelligence could be so gullible. I can only assume that all the Muslims he meets are senior leaders of the community who tell him what a wonderful book the Koran is.

"There have been a lot of calls today for him to resign. I don't suppose he will take any notice, but yes, he should resign."

The Bishop of Southwark, the Right RevTom Butler, also challenged the Archbishop's comments. "It will take a great deal more thought and work before I think it's a good idea," he said.

Although the means of forcing an archbishop out of office are so costly and arcane — short of his committing a criminal act, he could never be made to go — the row represents the most serious threat to the authority of his office since he became Archbishop five years ago.

It comes on top of the disintegration of the Anglican Communion in the dispute over homosexuality, with up to a quarter of the world's 800-plus Anglican bishops intending to boycott the 2008 Lambeth Conference at Kent, and insiders are wondering if Dr Williams's moral authority has now been damaged almost beyond repair.

Weblogs and other sites have been overwhelmed by comments from members of the public, Anglicans and non-Anglicans, the vast majority being highly critical of Dr Williams and his apparent appeasement of Islamism.

Senior government figures also spoke out against the Archbishop, as the row escalated and threatened to undermine his authority in the public arena as well as within his own Church. David Blunkett, the former Home Secretary, said that formalising Sharia in the UK would be "catastrophic" for social cohesion.

One of Dr Williams's arguments in favour of including some parts of Sharia under a parallel jurisdiction to secular law was to aid social cohesion. Mr Blunkett told the Today programme on Radio 4 : "I think this is very dangerous because the Archbishop used the term affiliations.

"We have affiliations to football clubs, to cricket teams, to all sorts of things that aren't central to our citizenship and the acceptance of that in terms of a common society.

"We don't have affiliations when it comes to the question of the law. And when it comes to equality under the law, we have to be rigorous in terms of making sure people do not find themselves excluded from it because of cultural or faith reasons."

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