To be honest I don't know much about the Shia/Sunni divide and the role of Saudi Arabia in that. I prefer not to comment on any sensitive religious issues.
I just think that their comments here are illogical, and even weirder when they start claiming it as "facts".
I personally do not think it is a religious thing at all.The Saud family and co find themselves in a similar position to the Shah of Iran and after the Iranian revolution they went very anti Iranian blaming religion etc as a difference whilst really they were and are scared of being overthrown by their people who might see a model in Iran that is more preferable. Look at how much they were against Egyptians and pro Mubarak