A lot can change in a couple of centuries. Right now, Catholicism is still growing in South America and Africa. As people in those regions become better educated and affluent, they may indeed follow the evolutionary path of other more affluent economies.

But with the resounding recent rise throughout the world in populism (which is a form of faith, but in a person or a dream rather than an economy), it's hard to know how humankind will respond to the challenges of the modern world.

We could choose to retreat from our current immersion in fast-paced life via technology and withdraw into one (or many) 'simpler' ways of life. If we do it wouldn't surprise me if we also choose to reimagine the world that surrounds us as being less concrete and more a realm of possibility in which choose our own reality.

I find it perplexing that you describe catholicism as progressive, since it maintains strict sexual purity standards, a male clergy, anti abortion and homosexuality etc.(Perhaps I misread you)

Isnt it true that SA is having extreme growth of the prosperity gospel form of fundamentalism too?

I wouldn't write it off yet. The popularity of protestantism is very prone to wax and wane with the times. A really charismatic preacher or two can make a big impact. Most of the mainlines we see in the US today started from just itinerant preachers and camp meetings. Personally, I think that's because the emphasis on "personal relationships" with God lends itself to more of a "social contagion" model of popularity, as people seek to imitate friends and neighbors who share spiritual experiences. That's not a negative thing necessarily. But they can't lean on tradition like the Orthodox or Catholics do.