Well, I voted NO, even when I'm not actually using that civic (too frequently I'm going Theocratic or Organized Religion). Pacifism did existed, but too few times to become a mayor "state politic". We have Native Americans, or, actually, the Swiss or the Japanese. In fact, an "Humanism" civic would be very unrealistic.
what historical nations have adopted religious Humanism?
This is it. We have Italy, during the Reinassance, and maybe the Netherlands a little time after. But no more. And Humanism is no more than a type of Pacifism. Humanist philosophers were pacifists, but there were pacifists who weren't humanists, like Gandhi's followers, or the Native Americans mentioned above, or even current Japanese.
The other option, Atheism, is better. However, it should not give science if Free Religion does. What can be made is to have a

bonus with Atheism (science becomes the only true belief) and a

bonus with Free Religion (morality keeps religion on the private sphere, so bussiness and corporations are more free to adapt to the country; e.g.:mcDonalds had a lot of trouble to establish in Islamic countries and India, but none in European countries, or in China, where religion is free).