Editor's note: Daniel A. Helminiak, who was ordained a priest in Rome, is a theologian, psychotherapist and author of “What the Bible Really Says about homosexuality and books on contemporary spirituality. He is a professor of psychology at the University of West Georgia. By Daniel A. Helminiak, Special to CNN. President Barack Obama’s support of same-sex marriage, like blood in the water Sexual sin defiles more than just our physical bodies (1 Corinthians 6:18). It has spiritual significance. Almost every book of the Bible renounces sexual immorality, indicating that God considers it a grave sin. Committing sexual sin is directly opposed to God’s will to sanctify us (1 Thessalonians 4:3).