Marriage equality advocates have welcomed a co-ordinated push by Australian Christian churches to rally against same-sex marriage, saying it will only help their cause.

Yesterday in Sydney, Catholic, Anglican and Greek Orthodox archbishops used the pulpit to condemn the same-sex marriage movement.

Churchgoers were also asked to lobby Federal MPs to vote against marriage amendment Bills due for debate in Parliament today.

"I urge you to pray about this matter and write speedily to members of Parliament expressing your support for marriage as at present defined," Sydney Anglican Archbishop Peter Jensen said.

But Anglican Archbishop of Perth Roger Herft said church pulpits were not an appropriate platform for political lobbying.

Though he opposed same-sex marriage, Archbishop Herft said it was not the Church's role to have its members lobby politicians.

"We are more than prepared as a Church to say gays and lesbians must be given respect and dignity through civil union," he said. "But for the benefit of family life, we don't believe the institution of marriage should be changed."

Last week, Emeritus Catholic Archbishop of Perth Barry Hickey spoke about the "futility" of alternatives to Christian marriage, which was "under fierce and hostile attack".

He told the 50th Catholic Eucharistic Congress in Ireland that Christians must champion traditional marriage over extramarital or homosexual relationships.

"We are told that homosexuality is a legitimate sexual outlet and often preferable because children don't come from their activities," he said.

"I think this new paganism is from Satan himself, the teaching of children the wrong message about human sexuality."

Australian Marriage Equality convener Alex Greenwich said the Church's efforts could aid the fight for marriage equality.

"I don't think any Australian likes to be told what to think and the research shows 53 per cent of Christians actually support marriage equality," he said.

The West Australian

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