We cannot be absolutely certain who the authors of the Gospels were, nor shall we be before we invent time-travel or have it all revealed to us by Almight God speaking from the heavens. Some will seize upon this gap, and claim other authors for those texts, or simply dispute the validity of the texts’ testimony about Jesus.
This is what happens when people learn enough to think that they know, but not enough to realise how ignorant we truly are. In point of fact, there are very, very, very few things which we truly know about anything, let alone the distant past.
We cannot prove, with arithmetical, 2+2=4 certainty, that Gaius Julius Caesar
ever existed; we cannot prove that the Normans invaded England in 1066; we certainly cannot prove that the works of William Shakespeare were written by William Shakespeare. Why should we be able to prove that Matthew wrote the Gospel of Matthew?
History, however,
is not about proof. It is about reading as thoroughly as possible every source which we can locate, and then assembling what appears to be the
most probable contingent image of the past which we can deduce from the available data. There are a great many testimonials to the existence of Gaius Julius Caesar, to the Norman invasion, to Shakespeare’s authorship, and, as pointed out by other posters in this thread, to the Four Evangelists having written the Four Gospels. There are no other contenders for these claims who are supported by as much testimony, which is exactly why we say that we think that history ran thus.
Why, then, do some scholars claim that someone else wrote Shakespeare’s works, or that the Holocaust never happened (thank you, David Irving), or that someone else wrote Matthew’s Gospel? All too often, they do it because it is
easy, and because it is
practically impossible to disprove, and because
it gets them noticed, which will sell their books, grant them tenure, and generally
further their careers.
Every once in a while, a good scholar will notice some discrepancy in the historical record, will track it down, and will then announce that we may well have been wrong all along. The academic world will acclaim this great discovery, lectures will be thrown out, books rewritten. On seeing this, a host of academics of inferior talent but superior ambition will set out to challenge some long-held idea, despite lacking any good basis for doing so. They will find the always-available grounds for doubt, and pursue them as if they were the gospel truth: they will make a career of it.
From the perspective of a literature student, as regards the authorship of the works of William Shakespeare or the Four Gospels,
- no such claim can be proved, and
- no such claim can be disproved, so
- no such claim is significant.
The same applies to the Gospels: we
do not know that their supposed authors wrote them, we
cannot know that their supposed authors wrote them, but we
do not need to know that their supposed authors wrote them, and we only actually suppose that those people wrote them because, given the data which we have, those people are
the most likely candidates. Thus, we continue with our understood view of history until someone can
demonstrate that it
is flawed.