At a confidential meeting at Lambeth Palace on Tuesday, they urged Dr Williams to create a parallel structure to free them from the interference of liberal bishops or risk a revolt against his authority.

The group, an unprecedented coalition of evangelical organisations and networks, is powerful because it represents about a fifth of all the Church of England's churches.

As many of these are large and thriving, according to some estimates they account for almost a third of its active membership and up to 40 per cent of its money, a significant weapon given the parlous state of Church finances.

The evangelical intervention comes with the worldwide Anglican Church on the brink of schism and will further complicate Dr Williams's efforts to keep the Church of England from disintegrating as well. Additionally, traditionalist Anglo-Catholics who oppose female ordination are threatening similar action if they are not provided with sufficient protection when women are consecrated as bishops.

Lambeth Palace confirmed last night that the Archbishop had held a "preliminary" discussion with the evangelical group and was taking the issues seriously. It is understood that he is urgently contacting all his fellow bishops to seek advice.

But liberals were dismayed, saying that evangelical attempts to split the Church over homosexuality would undermine its traditional tolerance, damaging not only the Church but also the nation.

The group of evangelicals who met the Archbishop is thought to have included the Bishop of Lewes, the Rt Rev Wallace Benn, who is the president of the Church of England's Evangelical Council, a broadly representative national network.

Others believed to be involved were the Rev Paul Perkin, a member of the General Synod and of Reform, the conservative evangelical organisation, and Canon Christopher Sugden, the executive secretary of Anglican Mainstream.

Group members presented Dr Williams with a covenant" making clear they would not accept the authority of liberal bishops regarded as having abandoned Biblical teaching by accepting gay priests or blocking evangelical growth.

The covenant makes clear that the whole group will support individual members who break their ties with their bishops, refuse to allow them into their churches, or who cut their quotas, the "taxes" they voluntarily pay into central Church funds.

As part of a growing resistance movement, retired or foreign bishops from abroad could be parachuted into evangelical parishes in defiance of the diocesan bishops.

The evangelicals believe Dr Williams has only a few months to create a "flying bishops" structure because the clash could worsen significantly after a summit in February in Africa of all the primates, the leaders of the 38 self-governing provinces of the worldwide Anglican Communion.

The meeting is expected to decide on the fate of the liberal Americans who precipitated the crisis by consecrating Anglicanism's first openly gay bishop in 2003.

Mr Perkin, the priest in charge of St Peter and St Paul in Battersea, south London, said: "The sleeping giant is waking. We have to be taken account of now."

Bishop Nazir-Ali, who was a leading rival to Dr Williams for the post of Archbishop of Canterbury, threw his weight behind the evangelical initiative last night, saying it demonstrated "the depth of feeling" within the Church.

But the Rev Giles Fraser, the president of the liberal pressure group Inclusive Church, said: "These rebel churches want to destroy the traditional breadth of the Church of England and turn it into a puritan sect. They must not be allowed to succeed."

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