Christian Churches affirm the doctrine of the Trinity as the orthodox understanding of God revealed in Scripture. They hold that God eternally exists as three co-equal, co-eternal persons (Father, Son, Holy Spirit) unified in one divine being and substance. This position reflects Nicene Creed orthodoxy, though the denomination emphasizes Scripture as the sole basis for doctrine rather than formal creeds.

The Restoration Movement principle of 'no creed but Christ, no book but the Bible' means that while Trinitarian theology is affirmed, explicit creedal formulations are not binding. The filioque clause (Spirit's procession from Father and Son) is generally accepted in practice, though not formally required.

This reflects the restorationist commitment to biblical theology without the addition of extra-biblical definitions, even while maintaining historical orthodoxy on the Trinity.