I've been doing a little research on this to, and the only sites that have anything on the oldest extant Caesar's Gallic Wars are all Christian sites basically parroting the same information (most verbatim). I'd love to see something from a museum site, or a university or something.
I have information in textbooks, and not on websites that I am researching.
Have you checked out a reference in Josephus' Antiquities, Tacitus' Annals, or Thallus' Histories, with references to the historic crucifixion and resurrection? Or Tolidoth Jesu's assertion that the disciples stole and hid Jesus' body?
Since for some reason you assume that Christians are not reliable sources, you should be interested in these four non-Christian historic sources.