Excellent.
Internal evidence supports pre A.D. 70 dates for the synoptic gospels. Paul's letters are dated even earlier and the sources for Paul's works would be dated even earlier for they were in circulation already at this time, likely within the same decade that Jesus' crucifixion took place. Many of the eyewitnesses to the events recorded by these men would still be alive and would have been able to expose as liars, these men had they written anything contrary to what was actually witnessed to have happened. Hostile testimony from the Pharisees is the most telling, for they themselves give testimony that the tomb was empty on the Sunday following the crucifixion.
The fact that the original autographs are not at our disposal is simply immaterial. Had the copies of the originals shown any evidence of deviation from the autographs, those who had written them and those who had read the originals would have been all too willing and able to reveal them as having been amended.
Very little if any original ancient historical texts contemporaneous with the NT texts have survived over the centuries. Historians are not unduly worried by this.
I agree. The NT as a whole is more a work of theology than history, but where the NT acts as a conduit for historical knowledge, it has never been proven to be inaccurate.