That often seems to wind up in the same place, but it's not the same thing. It's like the difference betweeen intelligence issues and wisdom issues.
To illustrate, I definitely don't think it's wise for you to allege that the orthodox statement of the doctrine of the Trinity cannot be derived from the Bible. It definitely can be derived from the Bible, as I pointed out to you--which fact you were not wise enough to respect.
(Do you see my dilemma? You are surely intelligent, but you are not discerning enough to keep out of trouble. [You just don't know the Scriptures, neither the Power of God.])
Interestingly, the reason why the orthodox formula for the Trinity is derivable from the Bible is because that's precisely where the early councils of the Church got the formula. No question about it.
So, the doctrine of the Trinity is an exception which proves the rule of our complaints against RCism.