Former Archbishop of Glasgow Mario Conti has described same-sex marriage as "morally defective" and urged ministers not to equate "homosexual unions with heterosexual marriage" by legislating.
Archbishop Emeritus Conti's latest remarks come as the Scottish Government continues to seek views on its Marriage and Civil Partnership (Scotland) Bill.
In a letter published in the Catholic journal, The Tablet, the Archbishop wrote: "While it is true, certainly within Catholic social teaching, that governments are not required to make all immoral actions illegal, to many it is unhelpful, unnecessary and indeed profoundly unwise for political action to do quite the opposite, namely to attempt through the law, by equating homosexual unions with heterosexual marriage, to render moral what is in itself morally defective."
He went on to say that the Catholic Church's opposition must "surely be worthy of consideration" given its task to "promote the moral well-being of society".
LGBT equality charity the Equality Network has called on the Government to stand firm on its proposed laws.