Everyone appointed to public office must say: "I do profess faith in God the Father and in the Lord Jesus Christ his only Son, and in the Holy Ghost...one God and blessed forevermore; and I do acknowledge the Holy Scriptures of the Old and New Testament to be given by divine inspiration." (Delaware Constitution, 1776 - consistent with the First Amendment).
It is important to note, regardless of current constitutional laws or their interpretation, that originally the authors of the Delware Constituion believed strongly that certain beliefs were integral to obtaining public office.
Our current American society and government is not as interested in the intentions of the founding fathers as we are led to believe. If so, there would be one religion, Christianity. There would be one God, the unified Father, Son and Holy Spirit. There would be one universal truth, the Bible.