What if you performed the wedding but didn’t change the litany.
“A man shall leave his mother and a woman leave her home and the two shall be joined.”
“God made them male and female...”
All the Biblical references straight(doh) from the KJV.
Play Paul Stookey’s wedding song.
Well, that should liven things up in church! LOL! I can just see it now - the entire place erupting in indignation. But they were the ones who asked for a Christian wedding.