One other argument against divorce is that churches only join couples but never separate them. Only the law courts separate couples but never the church.
“For the LORD, the God of Israel, saith that He hateth putting away…” – Malachi 2: 16
“It hath been said, Whosoever shall put away his wife, let him give her a writing of divorcement: but I say unto you, that whosoever shall put away his wife, saving for the cause of fornication, causeth her to commit adultery; and whosoever shall marry her that is divorced committeth adultery.” – Matthew 5: 31-32
“Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.” – Matthew 19: 6