Curbside I don't think he is a believer as such, just that he's a weak man who has found a way to be powerful, and he's taken that chance.
I think Fred would go along with anything that put him in charge, he's got money, power, status, his wife has to be subservient to him, he's been given a woman to rape, a women to serve in his home, a job that allows him to entertain diplomates and bring about laws, and still a connection to the old way of life through Jezebels.
I think Fred would claim to believe in anything if it came with all of that.