A society run by reasonable, rational, educated, objective, skeptical people who know that actions work and prayer doesn't –would tend to be atheist. We've already seen the world run by Christians. Whenever religion has had rule over law, the result has historically always been an automatic violation of human rights and an attack on factual education. So yeah, any Utopia would have to be humanist.

Patheos - Anti-theist Answers to Christian Questions (November 22, 2015)