“…institutionalizing same-sex marriage is nothing other than to “give approval to those who practice” the things that God’s word condemns (Rom. 1:32). And behind this moral affirmation, Paul tells us, is the religious “exchanging of the immortal God for images” (Rom. 1:23). To establish same-sex marriage, in other words, is an utterly religious act, by virtue of being idolatrous.“
Extract from a good strong article that speaks to our present day.