@Setanta,
Setanta, do you believe Homer wrote the Iliad?
Do you believe Tiberius Caesar was a Roman Emperor?
Well the belief in these is based on manuscripts of them copied from the original.
From these manuscripts, we can make an accurate picture of the Iliad and Tiberius's reign, simply by observing what all the manuscripts have in common.
There are 643 manuscripts used to compile the Iliad. Also, the earliest of these is dated to 500 years after Homer supposedly wrote it.
There are nearly 15000 manuscripts used to compile the New Testament. The earliest of these(that is undisputed as to the date) is within 25 years of when it was supposedly first written.
There are 9 non-Christian ancient writers that mention Tiberius Caesar within 150 years of Jesus's "supposed" life.
There are 10 non-Christian ancient writers that mention Jesus Christ within 150 years of his life.
If we include the Christian authors, then the numbers just get that much more stacked in favor of Christianity.
In either case, there is more evidence that the New Testament is accurate.
Yet you doubt this and accept the Iliad as being Homer's work and Tiberius as having existed. Even if you now tell me Homer did not write it, what of Tiberius?