The root of the problem being discussed is a lack of respect for Bible authority. False teaching on the subject of marriage, divorce and remarriage is just a symptom of his failure to respect the authority of the Bible. God's compassion and grace are not inseparable from God's law. Those falsely assuming that the passage relates to law in general fail to understand the import of Romans, Second Corinthians, Hebrews and Galatians. In these wonderful books of the Bible Paul demonstrates the passing of the Mosaic law and its replacement with the superior law of Jesus Christ.
Men make a tremendous error when seeking to quench New Testament law with grace.
Scenarios about people standing in water about to be baptized when the Lord comes are interesting, but dangerous. If one were in the middle of a vast desert when he learned of God's law about baptism for the remission of sins, then the best thing for him would be to die trying to get to enough water to be immersed. Arguments and scenarios like the aforementioned are as edifying as an attempt to determine whether or not Adam had a belly button. People who want to preach others into heaven would do well to be patient and wait on God. But, let me ask you a question.