Armstrongism explicitly rejects the Nicene doctrine of the Trinity as traditionally understood. Instead, it teaches binitarianism: the belief that God consists of two distinct divine Beings—the Father and Jesus Christ the Son—who are co-equal in power and glory but not three co-eternal persons. The Holy Spirit is understood not as a person but as God's active, impersonal power or force.

Herbert W. Armstrong taught that the traditional Trinity doctrine was not biblical but rather a pagan philosophical innovation imposed on Christianity at councils like Nicaea. For Armstrongism, the Godhead is a divine family of two Beings, and believers are called to eventually become members of that family through resurrection. This binitarian framework shapes Armstrongist theology and creates a sharp contrast with mainstream Christian orthodoxy.