Religions and states and classes and tribes and nations do not have to work or argue for their adherents and subjects. They more or less inherit them. Against this unearned patrimony there have always been speakers and writers who embody Einstein's injunction to 'remember your humanity and forget the rest.' It would be immodest to claim membership in this fraternity/sorority, but I hope not to have done anything to outrage it. Despite the idiotic sneer that such principles are 'fashionable,' it is always the ideas of secularism, libertarianism, internationalism, and solidarity that stand in need of reaffirmation.
If I were a dictator, religion and state would be separate. I swear by my religion. I will die for it. But it is my personal affair. The state has nothing to do with it. The state would look after your secular welfare, health, communications, foreign relations, currency and so on, but not your or my religion. That is everybody's personal concern!