All church schools should be abolished and replaced by secular schools, a Midland MP has claimed.
Lynne Jones (Lab Selly Oak) said no school should select children based on their religion.
She made the comments as Tony Blair revealed plans for a huge shake- up of state education.
The Prime Minister yesterday defended the proposals, which include drastically downgrading the role of education authorities, allowing schools to decide their own admissions system, and encouraging some independent schools to join the state sector.
A White Paper setting out the details will be published today.
But Dr Jones revealed that she had written to Ministers calling for a radically different approach.
Mr Blair hopes churches and other religious communities will play a key role improving standards. He also wants to make it easier for Muslims to open Islamic schools, alongside the many existing Church of England and Catholic schools.
But Dr Jones said no religious groups should be involved in state education.
In her submission to Ministers, she said: "The Government believes that the distinct ethos and character of faith schools helps them perform better.
"I would challenge this conclusion. Any selective school can achieve better than average results, and church schools are usually selective."
She added: "I do not accept the assertion that the ethos of church schools is somehow superior to that of nondenominational schools where staff show just as much love and professional dedication.
"It is our comprehensive schools, genuinely open to applications from all races and religions, that have the authority to claim that they have at heart the good of our whole society."
Dr Jones said: "Religious schools discriminate against everyone not of that faith - in their admissions and employment policies, their curricula and their assumptions about their religion."
In a major speech yesterday, Mr Blair said his education reforms would be " irreversible" and a "pivotal moment" for his last term in office.
Under the proposals, local education authorities would have a more strategic role, monitoring standards and commissioning services rather than running schools.
He said: "We will continue to put more money into our schools, but we will also complete the reforms we began so that in time we will have a system of independent, self-governing state schools with fair funding and fair admissions."
The majority of schools will become "trust" schools, backed by businesses, faith organisations and parents groups.
Local education authorities will have a more strategic role, monitoring standards and commissioning services rather than running schools.
There will be transport subsidies for poorer pupils, and school choice advisers to help parents select schools.
The White Paper will also make it easier for independent groups to open state funded schools. Shadow education secretary David Cameron said the Government was effectively reintroducing grant maintained schools, which were created by the Conservatives and abolished by Labour.
According to reports, the plans are also fiercely opposed by John Prescott, the Deputy Prime Minister, who fears they will benefit "nice schools" while working class families will lose out.