I agree, if there is something that exist, this gambling god would be the owner of the gambling casino. Why? Because he is the one who set rules, the one the gets all the profit from the losing players and he is the one dictating what ever have to happen in a casino including games, disqualification of claims etc. But in players, there is no such thing as gambling god since they just follow the rule of the casino owners.
If a gambling god exist then he would have cleaned out all the casinos he has played in. I don't think though that it is possible, even counting cards are so hard to do that normal people could not do it. And most of the time, people who are good at it doesn't really get away with it without the casinos knowing about it. For sure if they catch you doing it, you'll be beat up before you get out.