Did those people and councils who drew up the Canon of Sacred Scripture also believe in a Trinitarian God? If they are wrong on a Trinitarian God then they can be wrong on the New Testament Canon, right? Furthermore, are you telling us that something must be fully comprehended by your finite mind before you will believe it?
Chew on this:
“For neither the centurion nor that poor woman who for twelve years was wasting away with a bloody flux, had believed in the mysteries of the Trinity, for these were revealed to the Apostles after the resurrection of Christ; so that the faith of such as believe in the mystery of the Trinity might have its due preeminence: but it was her singleness of mind and her devotion to her God that met with our Lord’s approval: ‘For she said within herself, If I do but touch his garment, I shall be made whole.’ This is the faith which our Lord said was seldom found. This is the faith which even in the case of those who believe aright is hard to find in perfection. ‘According to your faith, be it done unto you,’ says God. I do not, indeed, like the sound of those words. For if it be done unto me according to my faith, I shall perish. And yet I certainly believe in God the Father, I believe in God the Son, and I believe in God the Holy Ghost. I believe in one God; nevertheless, I would not have it done unto me according to my faith.” Jerome, Against Luciferians, 15 (A.D. 382).
“We have said elsewhere that those things are predicated Specially in the Trinity as belonging severally to each person, which are predicated relatively the one to the other, as Father and Son, and the gift of both, the Holy Spirit; for the Father is not the Trinity, nor the Son the Trinity, nor the gift the Trinity: but what whenever each is singly spoken of in respect to themselves, then they are not spoken of as three in the plural number, but one, the Trinity itself, as the Father God, the Son God, and the Holy Spirit God; the Father good, the Son good, and the Holy Spirit good; and the Father omnipotent, the Son omnipotent, and the Holy Spirit omnipotent: yet neither three Gods, nor three goods, nor three omnipotents, but one God, good, omnipotent, the Trinity itself; and whatsoever else is said of them not relatively in respect to each other, but individually in respect to themselves. For they are thus spoken of according to l essence, since in them to be is the same as to be great, as to be good, as to be wise, and whatever else is said of each person individually therein, or of the Trinity itself, in respect to themselves. And that therefore they are called three persons, or three substances, not in order that any difference of essence may be understood, but that we may be able to answer by some one word, should any one ask what three, or what three things? And that there is so great an equality in that Trinity, that not only the Father is not greater than the Son, as regards divinity, but neither are the Father and Son together greater than the Holy Spirit; nor is each individual person, whichever it be of the three, less than the Trinity itself.” Augustine, On the Trinity, 8 Pref (A.D. 416).
Special Thanks to John Salza at
scripturecatholic.com for providing these quotes really fast.