Here is why separation of Church and State is a not only a good idea but a necessary concept for Freedom. Most people think that Constitutional separation of Church and State was designed to make sure that the government could not mandate a participation in a Religion. The idea being that Americans would be free to practice any Religion in any way that they choose or not participate at all if that is their desire.
Some groups think that the government is limiting their Freedom of Religion these days. For them nothing short of acknowledgment that America was founded on the Principles of one Christian religion would be good enough. They believe the American government should be run on the principles of Christianity. However, Christians can't even agree on what those principles would be. So with names like "Religious Freedom Act" they are trying to make secular laws that conform to a singluar religious way of thinking. These laws are nothing but the attempt to leigslate their own interpretation of judgement. That very law would restrict my freedom as an American if it differes from my belief.
The main reason I believe the Founding Fathers designed a separation of Church and State in the constitution was to protect the people from the rule of Religion. In order to form a more perfect union the writers of the Constitution realized that Religious states and Church run governments were toxic to real freedom. After centuries of watching Church leaders dominate governments and Kings claiming to be divine , the Founding Fathers decided to divide the idea of what is Church and what is State. The only way to insure complete feedom was to keep the government out of the Church. It is the perfect two way street, Government can't dominate chuches.... but by the same Constitutional mandate the Church can not run the government.
Why a Church, particularly a Christian one, would claim they have a right to discriminate and be judgmental toward any other human flies in the face of the supposed Jesus ethic that they claim to live by. Where in the Bible does Jesus condem homosexuality? When did Jesus preach that life begins at conception? The leaders of his day even condemed Jesus for his practice of associating with "sinners, tax collectors, prostitutes and lepers". Where is the story of Jesus casting out the demon of "Gayness" from a person in the throng?
Passing laws like the Indianna Freedom of Religion Act have nothing to do with Freedom or Religion. These are attempts to combine Church and State through the back door. Organized religion is trying to legislate their own personal brand of Dogma.
Keeping the Government out of the Church is important.... but keeping the Church out of Government is equally important to Freedom.
What absolutely IS in the Bible is Jesus talking about a Roman coin... "Render that which is Ceasars up to Ceasar and that which is God's to God". That is a clear and perfect statement of Separation of Church and State.
As you were.