Article 19 Section 1 of the 1874 Arkansas Constitution states that "No person who denies the being of a God shall hold any office in the civil departments of this State, nor be competent to testify as a witness in any court."
Makes sense when thepreamble to a State's Constitution is:
We, the People of the State of Arkansas, grateful to Almighty God for the privilege of choosing our own form of government; for our civil and religious liberty; and desiring to perpetuate its blessings, and secure the same to our selves and posterity; do ordain and establish this Constitution.
And Article 2:25 is:
Religion, morality and knowledge being essential to good government, the General Assembly shall enact suitable laws to protect every religious denomination in the peaceable enjoyment of its own mode of public worship.