No it isn't, though Protestants have to insist that it is. And the radical Protestant notion that G-d individually teaches each "saved" person is perfect in theory but absolutely unworkable in practice . . . unless G-d is teaching all those millions of people who disagree about so many issues different things.
Only G-d Himself is self-authenticating. If the Bible were self-authenticating, the Bible would (chas vechalilah!) be G-d.
At a certain point in history G-d authorized the Bible. But it wasn't two thousand years ago. It was some 3300 years ago when He spoke audibly to some three million people. That is how we know the Torah is from Heaven. But of course this didn't happen to chrstians so Protestants have to invoke the Bible as self-authenticating while the Catholics/Orthodox have to invoke the church as self-authenticating. One is bibliolatry, the other is ecclesiolatry.
The "new testament" which you are invoking was added to the bible by the historical Catholic/Orthodox church you and I despise so much. But thanks for playing.
Believe what you want. I know what I know and Who I know.
Why do you despise the Orthodox Church? Eastern Orthodoxy is one of the original Christian churches.
With your obsession with the Torah, you sound as if you might be involved in one of those “fake new” cults such as the noahides.