Christianity does not require insistence on "factual historicality of a particular set of events", or at least not disprovable ones. That's mostly a Western phenomena, to which American protestants seem particularly prone to the most extreme version of.
I think you can ultimately thank Thomas Aquinas for this movement. He was quite fond of a rational basis for God and repackaged the works of Aristotle for this end. But of course once you start down the road of adding rationalism to your religion then the whole mysticism of it can start to stand out to some. So some people started thinking it must be all literal and totally rational...
Eastern Orthodox Christianity still has no truck with that rationalism nonsense.
Yes, there are recognizably Christian subgroups that disavow all historical claims (and reinterpret Paul accordingly), but mainstream Christianity has always affirmed the bodily resurrection of Jesus and that (per Paul) this is essential to Christianity ... long before Aquinas.
N. T. Wright's "The Resurrection of the Son of God" is a very good read on this.
I think you can ultimately thank Thomas Aquinas for this movement. He was quite fond of a rational basis for God and repackaged the works of Aristotle for this end. But of course once you start down the road of adding rationalism to your religion then the whole mysticism of it can start to stand out to some. So some people started thinking it must be all literal and totally rational...
Eastern Orthodox Christianity still has no truck with that rationalism nonsense.