Why are Paul's writings in the Bible?

[LinuxGal]

This is how it started:

So all there is, is your "consensus of scholars". They are no doubt, all "Christians". 
What non-Christians *scholars* studied an historical Paul ?
Are there any historical mentions of a "Paul" or "Saul" in any secular sources ?

Note what I said exactly, and note how Bucky chooses to address this, by getting hung up on consensus rather than on the relevant points. The guy's an arrogant asshole trying to harrass me with a ridiculous demand based on just a part of what I actually said. I didn't even say the word "consensus" first, he did. I'm taking a look at his wall of text now to see if there's anything there that actually addresses what I'm interested in, and it's not all a bunch of red herrings.

I suppose he's frustrated.  You checked him at every point.  Called him on the argument from silence.  Invoked the principle of parsimony (aka Ockham's Razor)...as in, why would someone try to forge an unknown author named Paul?  So he fell back on the same dodge we get from the Jesus mythicists, that even secular historicists are in the pay of Big Christianity.  Truth is, Christianity is really Paulianity, and religions don't just fall out of the sky or evolve like languages.  There's a Joseph Smith or L. Ron Hubbard somewhere that starts the damn thing.