Argument #2: The Bible says that being gay is an abomination.
Leviticus 18:22 is the Bible verse most frequently quoted by opponents of same-sex marriage: “You shall not lie with a male as with a woman; it is an abomination.” But Leviticus is part of the Old Testament law, and the New Testament teaches that Christians should live under the new covenant, not the old one.
Jesus said in Matthew 5:17 that he came to fulfill the Old Testament law, and the author of Hebrews wrote that the law is “obsolete and outdated” and “will soon disappear” (Hebrews 8:13). That’s why Christians today widely accept other things that the Old Testament calls “abominations,” like charging interest on loans (Ezekiel 18:13), sex during a woman’s menstrual period (Leviticus 18:19), and eating pork (Deuteronomy 14:8).