The monument was paid for by the family of Rep. Mike Ritze, R-Broken Arrow, who authored legislation in 2009 authorizing the monument on the Capitol grounds.
The monument cost about $10,000. Costs for the materials of the base and other work were about another $10,000, which also were provided by his family and private donors.
The Ritze family paid a private contractor to install the monument and has agreed to pay maintenance costs.
The American Civil Liberties Union of Oklahoma is discussing whether to file a lawsuit over whether the monument is a constitutional violation of separation of church and state.
Wording on the monument is similar to markers in Texas and Utah that have withstood the scrutiny of the U.S. Supreme Court, Ritze has said.
Those markers stood on the Capitol grounds in Austin, Texas, and in a city park in Pleasant Grove, Utah, for decades before being challenged.