Vlad,
If you take Jesus quotes as fiction then you are bound by the same principles to take any quotes from ancient history as fiction.
Nope - extraordinary claims requite extraordinary evidence and all that. If a quote from ancient history says, "Saul's sandal broke and he dropped his amphora" that wouldn't stand up as necessarily epistemically true, but neither would there be any particular reason to doubt it. It's a commonplace consistent with known events so the fact that the evidence for it was effectively anecdotal and potentially changed over time wouldn't matter much.
By contrast, the claim, "someone was dead for a bit and then alive again" is outside all known experience of the way the world actually works so requires exceptional evidence to be taken seriously, and thus the same manifest frailties in the evidence we do have matter vey much indeed. Worse yet, this claim is translated and repeated by people
who are heavily invested in it being true - it's central to their faith beliefs – so the risk of those people getting a bit creative in the re-telling is much greater than it would be when they really don't care much either way.
All this should be obvious to you by the way. There are countless miracle stories from many faith traditions with supporting anecdotal evidence just as insubstantial as that for the resurrection. If you really want to set the bar so low as to insist that the resurrection story is true, then you have no choice but to accept the same conclusions for Mohammed and his winged horse and the rest.
But then Vlad historicity isn't your strong suit is it.