As Cuba's leader, Castro answered to no one and allowed no challenge to his authority.

Hispanics are the fastest-growing evangelical group in the country right now, an important constituency. But Trump's views, especially his views on immigration, did not exactly go over well with this faith constituency. Rev. Rodriguez told me that Trump's invitation created something of a stir in his world.

Fidel Castro was loved and hated passionately.

ISIS goes after any group that deviates from its extreme ideology, dissident Muslims, for example, or the Yazidis who practice an ancient religion distinct from both Islam and Christianity.

The collapse of the Soviet bloc ended the massive subsidies that had kept the Cuban economy afloat. The once-vaunted education and health care systems fell into disrepair. Fidel Castro's stubbornness, meanwhile, made political and economic change difficult in Cuba.

Fidel Castro is one of the most inspiring leaders of the 20th century.

The First Amendment to the Constitution says government can't establish a religion, but neither can it limit the exercise of religion. And that's the issue here. What does it mean to be free to exercise your religion? It's not about what you can believe. It's whether you can act on those beliefs.