James- Jacobi wasn't accepted as a part of the bible until sometime close to the 5th or 6th century I believe.
Jacobi is a very good example of an author that is challenged, one of the best examples along with Marcus.
And yes, Paulus is the real name for Paul. Just like Marcus - Mark, Matthaeus - Matthew and Lucas - Luke.
I don't think it does us any good to lower our standards when we are asking the most important question of all - Why are we here?
Do you?
There is not one person who would not believe in a certain God if that Deity showed up and once and for all made certain it existed.
All Buddhists, Hinduists, Atheists, Satanists, Muslims, Christians...
Everyone would instantly drop their old faiths if a God from another religion showed up and there was absolutely no doubt that all other religions were just hoaxes.
My point is that I will definitely become a Christian/Hindu/Buddhist/whatever, the day that religion shows any kind of evidence supporting their case.
Right now, all religions in the world is faith-based.
And to look at the Bible as some kind of holy document, which is even challenged for being written at the time of the events, is not reasonable.
If we don't know who wrote the Bible, how can we know if it's Holy?
Who said we don't know who wrote the Bible?
The Pentateuch (Genesis, Exodus, Leviticus, Numbers, Deuteronomy): Moses
The prophets of the Old Testament have authored books with their names: Isaiah, Jeremiah, Ezekiel, Daniel (though some don't consider Daniel a prophet, because he wasn't tasked with calling Israel to repentance), etc.
As for the New Testament:
The Gospels have their authors: Matthew, Mark, Luke, and John. Luke also wrote Acts, while John penned 1,2, and 3 John, as well as Revelation.
Romans, 1&2 Corinthians, 1&2 Thessilonians, Galatians, Ephesians, Phillipians, Colossians, Titus, Philemon: all authored by Paul.
Peter has two books: 1&2 Peter.
BTW, this claim of yours is false:
It's strange that nobody has a problem with that, as it relates to ancient figures, UNLESS it's Jesus Christ.
Socrates is one of the most controversial figures in ancient Greece. A lot of people challenge his existance, and claim he is just the brain child of Plato. Despite being mentioned in many texts by Plato.
If that is true, perhaps, these challengers seek to find references to Socrates outside of those, belonging to Plato. Lack of such doesn't mean that Plato crafted the man or character; but some may be making such an assumption, based on that.
We do, however, have extra-Biblical references to Jesus Christ. So, establishing Him as an historical figure is hardly a problem.