What We Believe. Two years after its founding, the AG established 16 doctrines as a standard to reach, preach and teach its people. These doctrines became our Statement of Fundamental Truths. Four of these truths are considered our core beliefs due to the key role they play in reaching the lost and building the believer and the church both now and for the future. These are nonnegotiable tenets of faith that all Assemblies of God churches adhere to. This list is derived from the official Statement of Fundamental Truths founded on the official Assemblies of God website.