Refess isn't any color, the fact you want to refer to it as a color at all is Magic's influence on you since in Alteil clan's are referred to by their name, not color, referring to a clan by its color is a Magic thing.
Yeah, but to many it's because of the names are confusing, and to a new player the name can be just some random garble of letters that sounds ugly.
Therefore most people have it easier to identify their religion (my impression of it) by the colours they have in their "logo". Easier to grasp. I had no idea that Magic the gathering went by green/black/white and such, thought they went by names such as "Grass/fire/Water/darkness and such.
I've mistakenly called Gowen for: Gallow, Gowan, Gawon (Reminds me of Ganon), Gakow and so on. And there are more.
But now, I know them all by reading the thread names of each religions strategy thread, that I see daily.