every religious group not Christian is a humanist religion nowI'm not willing to agree with "terrible". We're not rocking generic pagan here. What did happen is that Islam got made into a humanist religion like Fetish and Hindu, and so far I would put it somewhere between those two, well behind Christianity but still better than most pagans, Confucian, and filler junk (in terms of in-game utility) like Sikh/Zoro/Judaism.
Humanist + high legalism + dhimmi estate is a respectable monarch point saving on tech. It's not going to beat 10% core cost reduction in the end game, but it's still better than fetish considering you can easily sit on +1 or +2 tolerance of both heretics and heathens and never convert anything.