You are listing Abrahamic faiths. If you are not, you can't keep up with a decent conquest pace with religious. It's impossible; your BT/time simply outstrips your conversion power, and while vassals are better than before, they're still unreliable for conversion too. Something like Hindu or Confucian just won't have the power to convert all of the provinces you can take (especially not Sunni). The worst by far, however, is pagan. Pagans get nothing from decisions to improve conversion strength, can't take defender of the faith, and only get 1 more missionary if they take Rome.
But humanist offers an alternative. If you can get tolerance to anything over 0 (not exactly 0 due to a bug), all such provinces give 25% unity. You get 50% at 1 and 75% at 2. Thus, if you have 2 tolerance you could own only wrong-religion provinces and still have 100% unity with humanist.
I would say humanist is strictly better than religious for most nations if it weren't for one thing: deus vult. It's available early, it gives a powerful war goal, and it gives tremendous dip cost reductions. Religious is otherwise inferior to humanist for empire stability, but it is for many nations "good enough" without burning 2 groups on ADM.