In reality marriage cannot be "redifined" it can only be destroyed and rebuilt in a "new" image. If marriage is not one man & one woman then it could be any thing you want. It could be three men and two women or brother and sister. After all wouldn't these just simply be consenting adults? Our country does have history and right to protect traditional marriage. Utah was allowed into the union based on them banning polygamy. Society is built around marriage and family. Although our recent culture has gotten away from this it is still the prefered structure. Fundementally it is wrong because the Bible says it is regardless of what any of us think.
As far as seperation of Church and State. The Constitution states that government should not establish religon. That's it, not that it should ban it or keep it's influence out of law, but that the government should stay out of the way. If you would like more information on the historical tie between the United States and Christianity visit
www.Americablessgod.com 
