The Church of England added that introducing gay marriage could also lead to challenges to civil partnership law, as removing the concept of gender from marriage while leaving it in place for civil partnerships would be unlikely to be "legally sustainable".
In a highly critical response to the Government's consultation on gay marriage which closes on Thursday, the Church of England said several "major elements" of the proposals had not been thought through properly and were not legally "sound".
More top news
The Queen and Prince Harry have responded to a 'game on' from Michelle and Barack Obama in competitive Invictus Games videos on Twitter.
British astronaut Tim Peake takes part in a test to see how a Mars rover handles when it's controlled from further away.
Claudio Ranieri has called on his Leicester City players to finish the job of winning the Premier League.