SOME of Australia's most prominent Christian leaders are expected to read out and distribute anti-gay marriage letters at their Sunday services tomorrow.

Statements from Anglican, Catholic and Greek Orthodox leaders have been coordinated ahead of further debate on gay marriage in Parliament next week.

Churchgoers will be urged to contact their Federal MPs to register their opposition to gay marriage.

The head of the Greek Orthodox Church has written to his congregation saying that altering the traditional form of marriage is, in his view, against the sacredness of marriage and of the family as taught by the Christian faith.

The Anglican Archbishop of Sydney, Peter Jensen, has written a letter to all his parishioners saying that for the good of society, the definition of marriage should not be changed.

Read more at ABC news online.