I think you could be on to something there as far as Deities go, but I don't think it should be changed or anything, because it's the same in real life. Some religions have a far greater reach than others, and some belief systems are scorned or frowned upon by people in society, but to the people that believe in them they are still as prominent as the next.
You can make life very difficult for yourself on layo depending on your deity and/or subrace though (as it should be
) such as Chanda, who I imagine is the only cleric of Corath on the server. I myself used to have a character here called Vyl'iath Ezra, who to the best of my knowledge was the only cleric of Baraeon Ca'Duz to have been around. The problem with playing that character was pretty tough, because most people wouldn't associate with him because of who he was (I never made an attempt to hide it, I even had the Ca'duz shield symbol), it was fun for a while, but then it kind of started to drag because even a lot of the other Drow characters wouldn't work with him because of it.
I think I strayed a bit off topic now, and I've actually forgotton what my original point was going to be...heh.