The Bishop of Oxford is backing a bill to give gay partners the same legal rights as married couples.
Speaking in the House of Lords, The Rt Rev Richard Harries made it clear he did not fear giving gay couples equal rights in the eyes of the law and said the Civil Partnerships Bill could boost long-term commitment in relationships.
But he admitted some church leaders opposed the move, seeing it as effectively legalising "gay marriage".
Under the proposals, gay and lesbian couples will be able to register their union and qualify for the same rights as married couples, including pension sharing, inheritance and benefits. It will also mean they can be treated as next of kin in hospital.
Mark Whittaker, who organised last year's Oxford Pride event, said: "The gay community in Oxford will certainly welcome these proposals which should provide fairer treatment when it comes to inheritance rights and taking over tenancies."
Bishop Richard added: "I believe this Bill, which makes a place in law for committed partnerships, could strengthen rather than undermine the Christian understanding of marriage."
He said the Bill, being considered by Parliament, had sparked fears that traditional heterosexual relationships and church teaching would be weakened.
"There is an ambiguity here that some find worrying and there are fears that the Bill could undermine the institution of marriage and its special place in the law of this country," the Bishop said.
"These fears are widely shared in Church circles and the Government will need to address them."
On Saturday, May 1, same-sex couples will have the chance to take part in blessings and commitment ceremonies at this year's Oxford Pride festival.
The county council is launching its new commitment ceremony for lesbian, gay and heterosexual couples at the event.
Homosexual partners will be able to sign an official document before a registrar and two witnesses.
The Government has insisted its plan, which won widespread support among MPs and looks set to become law, does not amount to gay marriage.
But leading Tory Baroness O'Cathain said: "This Bill creates gay marriage in all but name. It is wrong to create a parody of marriage for homosexual couples."
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