Much of the misunderstanding in the area of “the separation of Church and State” hinges on the interpretation of the First Amendment. The religion clause of the First Amendment states: “Congress shall make no law respecting an establishment of religion or prohibiting the free exercise thereof.”
Traditionally, it has always been understood that this meant that in America there would be no State Church, like the one they had in [18th century] England. Historically, it has been understood that there is a separation of the function of the Church from the function of the State.
But that does not mean there is to be a separation of God or Christianity from the State…
Kennedy, D.J. and Newcombe, J. (2001). What if Jesus Had Never Been Born? [ebook]. Thomas Nelson, Inc, Nashville. Location 1334