Separation of Church and State

Campbell and Kean state that Thomas Jefferson believed that the First Amendment of the US Constitution intended for a separation of church and state. What Jefferson believed may be somewhat correct it is not entirely. One example is that same sex marriage is not recognized across American. The only reason for this seems to be that it is not intended for two men or two women to be married in the Bible which shows that religion is factoring into government when it is not meant to. However, a counter example would be the Muslim group that is trying to build a mosque at Ground Zero. So far the mosque is still going to be built even though many Americans are against it.