Not at all a fair comparison; Churchill wrote at a time when many other historical accounts were in circulation, and thus was not free to credibly write anything he chose. Here are two better analogies:
1) Would you doubt an account published of the rise and fall of the third reich written in 1965 by say Winston Churchill before he passed away -- once you knew that other, contradictory accounts had been systematically suppressed by Churchill supporters, and proponents of those other accounts had been persecuted?
2) Would you doubt accounts of Jesus's ministry if the only accounts we had were written by Roman officials and scribes in Herod's court?
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