Those global Christians

What current world-wide movement went from zero to 500 million followers in about a hundred years?  It might be hard to think of one.  The growth is called "staggering", "incredible."  It's a kind of Christianity that didn't exist before 1900 but which finds a home in diverse denominations like Baptist or Catholic:    pentecostal/charismatic.

"The typical late twentieth-century Christian was no longer a European man but a Latin American or African woman," and there's a good chance she is pentecostal.

The Lausanne World Pulse offers these points (among others) to explain how the movement has managed to grow so fast:

• "contagious relationships" - "Studies reveal it is not the big events or the big names that are decisive in Pentecostalism’s dramatic growth; the movement grows because people whose lives are dramatically changed tell their friends and family."
• "adaptive methods" -"Almost instantly Pentecostalism became Russian in Russia, Chilean in Chile, African in Africa. Pentecostalism’s freedom in the Spirit created grassroots movements that are at home in almost any context."