Just so you know, the management of the board would prefer that only moderators and hierarchy members respond to posts in this particular forum (CoS Questions).
However, you are correct, and that's about all that needs to be said.
"Theistic Satanists" are, to my way of thinking, no dirfferent than Christians, Muslims, Jews, etc. They ALL believe in imaginary people.
'Belief in one false principal is the beginning of all unwisdom...'
They all put their fate in the hands of an external entity who may or may not even exist. This, from a practical point of view, seems rather foolish.
Such a person could probably register as a member of the Church of Satan
, however, upon filling out an Active Membership or interacting with other members - they would quickly be found out and would likely be ejected on principal.