ohhh k then.
You're right about them abandoning those stories, but it's not because of so-called "increase in knowledge" since mostly everything supernatural cannot be falsified anyway. You either believe them, or you don't.
Frankly, they don't want to be seen as anti-science or "unscientific". Believing the Flood actually happened and Adam and Eve were real, puts them dead in the crosshairs of science and evolution, so to speak.
I don't buy for one second that Orthodox Christianity is open to "increases in knowledge" -- many Churches are losing members due to this, so they're "going to where the people are", scientifically speaking.
You may be right in some repsects, but I think the evidence favors my POV.