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".
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The man, in his thirties, was found with stab injuries on the upper deck of a bus in Handsworth, Birmingham, on Monday night.
Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.