Ringo writes:
The question still remains: Why does removing the resurrection make it cease to be Christianity but removing the literal six-day creation doesn't?
Because without a resurrection Christianity becomes just another temporal lifestyle with no hope of an afterlife.
The length of the Genesis day was not established until the sun was created on day four of creation. Before that there was no basis for a 24 hour day.
BUZSAW B 4 U 2 C Y BUZ SAW.
The immeasurable present is forever consuming the eternal future and extending the infinite past.