Leviticus is a holiness code written 3,000 years ago. This code includes many of the outdated sexual laws we mentioned earlier, and a lot more. It also includes prohibitions against round haircuts, tattoos, working on the Sabbath, wearing garments of mixed fabrics, eating pork or shellfish, getting your fortune told, and even playing with the skin of a pig. (There goes football!)
Once again, people are using portions of a greater picture without understanding the true intent. While there isn't enough room here to say much more, it behooves those who wish to condemn others based upon convenient selection of Bible verses to do their homework first.
More explanation is available at: http://www.soulforce.org/article/homosexuality-bible-gay-christian. This sign MUST be taken down because it is baseless in its assumptions and without concern for the true meaning of God's Love.