====You guys have tried before and failed miserably. The Trinitarian formula cannot be proven Scripturally. There are the names, but not the formula. The most that can be proven Scripturally is a subordinationalist theology that some of the Reformed’s nuttier allies believe in.====
http://www.newadvent.org/cathen/15047a.htm#II
In Scripture there is...no single term by which the Three Divine Persons are denoted together. The word trias (of which the Latin trinitas is a translation) is first found in Theophilus of Antioch about A.D. 180. He speaks of "the Trinity of God [the Father], His Word and His Wisdom (To Autolycus II.15). The term may, of course, have been in use before his time. Afterwards it appears in its Latin form of trinitas in Tertullian (On Pudicity 21). In the next century the word is in general use. It is found in many passages of Origen ("In Ps. xvii", 15). The first creed in which it appears is that of Origen's pupil, Gregory Thaumaturgus. In his Ekthesis tes pisteos composed between 260 and 270, he writes:
There is therefore nothing created, nothing subject to another in the Trinity: nor is there anything that has been added as though it once had not existed, but had entered afterwards: therefore the Father has never been without the Son, nor the Son without the Spirit: and this same Trinity is immutable and unalterable forever (P.G., X, 986).
The article speaks of Scriptural evidence, which is well presented here. And it speaks too, of the Catholic Church's teachings from very early on of forms of the Trinity. The conclusion is very interesting as well. Did you read it?
That reference uses Mat 28:19 as its strongest argument. Mat 28:19 is a latter-day addition by some accounts, since it doesn't fit anywhere in the Bible and is contrary to what Jesus taught about being sent for the lost sheep of Israel. Although (miraculously?) no extant copy older than the 4th century of 28:19 is known, indirect evidence (from repetitive quotes of the same verse by authors such as Eusebius in the 3rd century) suggest very strongly that the original did not have the triniatrian formula. This is also supported by all references in the book of Acts to apostolic baptisms being preformed in the name of Jesus.
The Comma Johanneum (1 John) is a known fraud. Those are the only "hard" proofs the Bible has to offer.