"There is an overwhelming body of evidence showing that same-sex relationships are inherently unstable and reduce the life expectancy of those involved," claimed church spokesman Peter Kearney.
He was commenting on the case of two children who have been adopted by a gay couple. Their grandparents wanted to adopt but were informed by Edinburgh City Council they are too old to do so.
Mr Kearney told the Daily Mail: "This is a devastating decision which will have a serious impact on the welfare of the children involved. With this in mind, the social work department has deliberately ignored evidence which undermines their decision and opted for politically correct posturing rather than providing stability and protection. It is impossible to see how this decision is in the best interests of the children."
In October the Roman Catholic Church in Scotland's Bishop’s Conference attacked the right of gay couples to adopt.
"Catholic adoption agencies are now to be indifferent as to whether a child is to be placed with a married couple of a homosexual cohabiting couple; this is gravely wrong," the bishops said.
"Policies must help encourage family stability."
The Bishop of Motherwell, Jim Devine, has been more outspoken.
Last year he claimed that the "gay lobby" attends Holocaust memorials "to create for themselves the image of a group of people under persecution."
The bishop said there is a "giant conspiracy" going on and claimed he is taking on the forces of secularism.
"The homosexual lobby has been extremely effective in aligning itself with minority groups.
"It is ever present at the service each year for the Holocaust memorial, as if to create for themselves the image of a group of people under persecution."
He criticised the decision to honour Sir Ian McKellen for his work for equality, pointing out that Oscar Wilde was jailed for homosexual offences.
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