I'd be more concerned if there were no irregularities in the texts, to be honest. If they were word for word, time for time, place for place identical I'd be far more suspect of a conspiracy to put something together. You'd have thought they'd bother to get their facts straight if they were making up something so momentous.
As for Nazareth, the arguments for its' non existence only go so far as there being nothing written about it in, for eg, Josephus or other first century writings. But would there really be records of a tiny and looked down upon hamlet, especially in such times? Why would Nazareth be documented? Hardly that great centre of commerce. Archaeological evidence has been hotly discussed but even non believing scholars have advised caution on this one. It's not clear cut. Thing is, for all of these points there will be a wealth of internet sites - the for, the against and the slightly off the wall. You could decide to be convinced by either, but for me, it's the reality of relationship in my life that makes the difference. I am also of fervent conviction that the evidence for Jesus stands strong, despite so much written against it all.
Josephus - he was 1st Century, that's enough of a contemporary for me, when we're talking 2,00 years
He mentioned Jesus more than once, and mentioned his execution and the claims of his followers (disputed by scholars, but hey, what isn't?)
The claim that 'bible writings are a rip off of ancient writings from eg assyria' is yet another one which is unfounded in fact. For one, Jewish 1st Century writers would have had no way or reason to know of any such 'writings'.
I believe it happened, and transforms lives today. I know words will never prove, and don't really wish to fight with words. I enjoy engaging with the issue, but personal attack goes a little beyond the bounds.