I”m not really going to jump into the middle of this because I’m not well enough versed and I’d get slaughtered, however, if you don’t believe in the inerrancy of the Bible, then you can start picking and choosing, and therein lies a real problem. Whether the earth was made in 7 days or not isn’t the problem, but there are other things that certainly would be (the literal resurrection for instance or if Jesus is the literal Son of God).
But, as I said, I’m just tossing things out, I’m not qualified to really debate the issue. However, this is why the issue is so important that people get so riled up.
If Jesus had tried walking around in a Roman province in an actual dead human body for 40 days, Romans would have seen him and crucified him a second time and done whatever it would have taken to ensure that he STAYED crucified. I assume the resurrection was the sort of thing Julian Jaynes described but it was not any sort of a mass hallucination and to the people who experienced it, it was utterly indistinguishable from Jesus having come back in his own corporeal (and dead) body. That IS the way Jaynes described that sort of experience and that is also the way that the OT ghost story involving Saul, the prophet Samuel, and the "witch" of Endor reads.