For a comparison of books in the bible, from a rather biased, distorted, and wrong, perception:
And of course if we're talking about the DSS, then there are also other books contained in it that aren't in the bible (tho this obviously isn't
particularly important in some respects)
But the big question is how much of modern christianity is based on these writtings, and how different would it be if other writtings were included.
I don't see how there can be a resolution to this, however, if you posit that there was some other message in christianity, and then men changed it
by making fake gospels, perhaps to replace other real gospels, and there are 'rejected' works that claim to be gospels and are quite different from
the accepted ones, then there'd be something.
But again, how can you possibly demonstrate this, and how can you possibly say that the god worshipped by christians isn't christ? Its like how
people will insist that muslims are actually worshiping baal or the moon god rather than the god of the old testament. If they claim it and if they
beleive it, how could anythign else be true?
With christianity tho it is perhaps a bit different, because we are talking about the anti-christ, and that its sufficient that he merely fool
So modern christianity could be the anti-christ religion in so far as, perhaps, the original christianity was something totally different, ie more
like gnostic christianity, and the deception and false prophet warned about in Revelation is this idea of christianity being the competing version
that it is today.
Of course, this requires that John at Patmos is a gnostic christian, when there doesn't seem to be any reason to think that he was.
And of course, this is all just speculation. We could just as easily say that the gnostic version of christianity is the anti-christ religion.
And on the other hand, it would look like the best way for the anti-christ to get christians to turn away from god is to present himself as such, ie,
when to all outward appearances we're witnessing the second comming of jesus, its actually the anti-christ in disguise, and there'd really be no way
to tell the difference.