Are you calling same-sex marriage a sin? Because the list of such silly "sins" is
a list of common practices/occurrences
No. God does. "If a man also lie with mankind, as he lies with a woman, both of them have committed an abomination: they shall surely be put to death; their blood shall be upon them."
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I don't agree with you. There have been limitations on marriage in every society. You can't marry your siblings, parents etc. that is a healthy limitation, no matter how mutual they say it is.
Who defines a healthy limitation?