In typical style, I will discuss a few points that piqued my interest:
1) I personally don't believe there was a historical "Jesus of Nazareth" (or Yeshua ben Nazareth, if you prefer). My own personal view is that "Jesus Christ" is a composite character drawn from perhaps dozens of historical and ahistorical personalities --- including Pagan godmen like Dionysus, and the Yeshua ben Nun (Joshua) of the Old Testament. Thus, tossing the "J-word" around in an attempt to impress me will have very little effect.
2) It never ceases to amaze me how these fundie-types always overemphasize the "fire 'n brimstone" aspects of the New Testament, and always underemphasize the aspects that parallel with the Bodhisattva Vow --- y'know, the whole "unconditional compassion for all sentient beings", thing?? Or, if you prefer, "turn the other cheek"?? "Love thy enemy"?? C'mon, now....
3) Gnosticism was, of course, mentioned. And, unsuprisingly, blatantly misinterpreted and misrepresented. To note, calling "Paul" anti-Gnostic, unless you are talking about the forged "Pastoral Letters" (Timothy, Titus, etc) is rather laughable. Read Galatians sometime.
And, by the way, "Paul" did claim to teach a "secret" Christianity only available to the pneumatically prepared. The word translated for a "perfect" or "mature" Christian in Greek, teleote, actually means "initiated". Ever wonder why the only guys that directly claim to follow his teachings, like Marcion or Valentinus, were Gnostics?? Ever wonder why the orthodox/literalist movement never claimed "Paul" as "one of their own" 'til around the time that the Pastorals were forged, in the late 2nd century?? Justin Martyr (mid-2nd century) sure didn't seem to know who the hell this "Paul" was...
Also, in no way does "speaking tongues" necessarily have anything to do with "Gnosticism". But, as a fun little side note, one of those "heretical" Gnostic works, the Gospel of Thomas, is now increasingly recognized as one of the source materials of some of the later Gospels (such as the Gospel of John, another pro-Gnostic work). It has a very close relationship with the source material identified as "Q".
4) Hardheadjarhead is quite correct in that a text does not, and cannot, prove itself. Contrary to the title of this thread, no "proof" has as of yet been provided. Nor will it be.
Have a good one.