what came first..

[Cilia]

I do wonder about Ramuh's statement on Light and Darkness, about how there was no light and darkness before man. Could he be wrong? Or could it be that his viewpoint is incorrect, and that man's birth was a consequence of the division of light and dark from their primordial unity?

He didn't make a statement, Ramuh was simply musing on the origin of Dark, questioning if it came into being with the birth of Man.

From what we can tell and what information we've been given, this isn't true. According to Hydaelyn Light and Dark existed before any sapient race (or hell, even the planet we live on), so Ramuh's guess is wrong. Probably. That said, both Ramuh and Kan-E-Senna have questioned whether or not Dark is an inseparable part of Man's existence (with Ramuh's above musing on its origin, and Kan-E stating that the Dark within us attracts the Dark without).

That said, Man coming into existence as a byproduct of Light and Dark separating is possible. Very possible. But so are many things.