Fastest growing branch of Christianity, had 279 million members in 2011. Fastest growth seen in Africa, South America & Asia(inc India esp South).
An interesting aspect is that all aren't non-X converts, it is cannibalizing on Catholicism on a large scale. https://twitter.com/TheEconomist/status/1265834597159485441?s=19

Till the 1980s, 90% of South Americans identified as Catholics. In 2014 that number had declined to 69% and the trend has continued since. The leavers have shifted to the Pentecostal church. https://qz.com/342810/why-the-catholic-church-is-losing-latin-america-and-how-its-trying-to-get-it-back/amp/

Majority of Protestants in Latin America were raised as Catholics, all of this change has occured within a generation.

The political effect of it is most visible in Brazil. Evangelicals now form 25% of the pop & Catholics are expected to become a minority by 2030. Bolsonaro himself a Catholic has allied with Evangelicals & his own son is a Protestant. https://www.google.com/amp/s/amp.theatlantic.com/amp/article/551423/

It is happening in India too, apart from converting non-Xs, Pentecostals are gaining converts from traditional Catholic denominations in India.
https://m.rediff.com/news/1999/feb/13christ.htm

Pentecostals offer a more personal relation with Jesus & God, focus more on miracle healings & have appropriated more local traditions & customs. Also hold rock concert style recitals.
A more virulent form of Xnity plus shows the changing nature of worship.