perhaps they meant to say it didnt happen in the sense that god or magic moses or whatever parted the sea. i have no idea about the whole thing so i just assume the whole thing is made up. i have no reason to care what happened or didnt happen with some sea and some dude that may or may not have existed.
The truth can be inconvenient that way. I don't see it that way, of course. When I am proven wrong, it's because I have learned something new. To me, that's exciting and wonderful.