Article 22 of the Constitution required officeholders to swear belief in the Trinity and the “divine inspiration” of the Bible.
Art. 22. Every person who shall be chosen a member of either house, or appointed to any office or place of trust, before taking his seat, or entering upon the execution of his office, shall take the following oath, or affirmation, if conscientiously scrupulous of taking an oath, to wit: “I, A B, will bear true allegiance to the Delaware State, submit to its constitution and laws, and do no act wittingly whereby the freedom thereof may be prejudiced.”And also make and subscribe the following declaration, to wit: “I, A B, do profess faith in God the Father, and in Jesus Christ His only Son, and in the Holy Ghost, one God, blessed for evermore; and I do acknowledge the holy scriptures of the Old and New Testament to be given by divine inspiration.”And all officers shall also take an oath of office.
Thorpe, Francis Newton, ed. The Federal and State Constitutions, Colonial Charters, and Other Organic Laws of the States, Territories, and Colonies Now or Heretofore Forming the United States of America. 7 vols