Americans place less importance on religion in their lives than do people in a number of countries in Africa, the Middle East and Asia -- but more than residents of many other Western and European countries.
In the last two decades, several religious groups have moved to allow same-sex couples to marry within their traditions.
Acceptance of homosexuality is rising across the broad spectrum of American Christianity, including among members of churches that strongly oppose homosexual relationships as sinful.
The three countries on the pope’s itinerary -- Uganda, Kenya and the Central African Republic -- all have sizable Catholic populations. But they also have seen violent clashes in recent years.
Only about half of Millennials say they believe in God with absolute certainty, and four-in-ten say religion is very important in their lives.