There have been a plethora of letters using Jesus Christ to justify homosexual marriage and other homosexual behaviors.
Jesus, like other Christians, tolerated homosexual behavior but he would tell the homosexual "go and sin no more," just as he did the woman who was having an adulterous affair.
Marriage for several millennium has been the province of a man and a woman in a religious context. Now the state can sanction marriage and marriage does not have to be performed in a religious setting (it can be in a capitol, a courthouse, aboard a ship, etc.). That does not change the original context or definition of marriage as a religious function.
Marriage has nothing to do with equality under the law, fairness, etc., that these letters have cited.
The state government or federal government should not be sanctioning sinful behavior in direct contravention of biblical teaching.
If the government wants to go against God's teaching, our leaders should not call it "marriage." They should invent a word for homosexual unions -- not marriage, which has stood the test of time for thousands upon thousands of years.
H. Ray Sigler