[A.A. Cunningham]

The twelve articles of what has been known as the Apostles' Creed since the second century appears in the New Testament.

The doctrine of the Trinity was not defined until well after the death of the last Apostle, John. Using your logic we should pay no attention to that or to the Bible either, since it's canon was not defined until the fifth century, again long after the death of the Apostle John. And we all know that none of the Apostles possessed a copy of the Bible.

[editor-surveyor]

The full new testiment was available since 95 AD

Everything but the Revelation was in use by 70 AD.

Cannon issues are mostly politics, not theology.

[editor-surveyor]

>> “The doctrine of the Trinity was not defined until well after the death of the last Apostle, John.” <<

.
Wild opinion.

The workings of the trinity were set out in the 5th chapter of John’s first epistle.