The Doctrine of the Trinity is 100% biblical. It is accepted by Evangelical Protestant churches on that basis alone. If it were not biblical and only something that came about like the Papacy some 700 years later that can not be defended or justified Biblical texts it would have been rejected by Evangelical Protestants as we Reject the Papacy as it is not found in the Bible let alone the first 700 years of christendom and did not take its full from as it is today till he Great Schism of 11th century.<quoted text>
Not true protestant churches have lots of teachings outside of the Bible. For example the main doctrines such as the trinity and incarnation are based on Catholic creeds.
Of course its about private interpretation. You just dont like to face the facts that you are in rebellion because of your unauthorised traditions and in rebellion with the catholic church.
Those are the Facts
Again no its not about private interpretation, its about Sola Scriptoria only using scripture as the basis for doctrine not man made tradition.