Some centre-left politicians have scorned the Vatican for speaking out against the initiative, but the Pope said the Church had the right to be heard.Yes, he's the Pope. That doesn't mean he doesn't understand what's at stake.
"If they say the Church shouldn't interfere in these matters, then we can only reply: should mankind perhaps not interest us?" he said.
The Pope said granting legal recognition to unwed couples was a threat to traditional marriage, which required a higher level of commitment.
But he saved his strongest words for those who suggest gay couples should be put on the same level as a husband and wife.
"This tacitly accredits those dismal theories that strip all relevance from the masculinity and femininity of the human being as though it were a purely biological issue," the Pope said.
Theories "according to which man should be able to decide autonomously what he is and what he isn't," end up with mankind destroying its own identity, he said.
Here's the real question: why doesn't he have this kind of retort to Muslim theology?