(Melanie Stetson Freeman/The Christian Science Monitor/Getty Images) Tens of millions of Latin Americans have left the Roman Catholic Church in recent decades and embraced Pentecostal Christianity, according to a new Pew Research Center survey on religion in 18 Latin American countries and Puerto Rico. Indeed, nearly one-in-five Latin Americans now describe themselves as Protestant, and across the countries surveyed majorities of them self-identify as Pentecostal or belong to a Pentecostal denomination.