Rainbow is the sign for God's mercy redemption and righteous judgment on wickedness of mankind, e.g. HOMOSEXUALITY, fornication, idolatry, adultery. But it's interesting that it's become a sign of homosexuality today! Hope they aware of God's righteous judgment on their unbelief. God loves righteousness and He is so righteous to make a sinner who believes in Him righteous! And equally God hates wickedness.