My fellow Kiwi Kristians, I have asked a similar question in the Kathedral already, but where do you all think that the future of Christianity is headed worldwide?
It's hard to say, and I don't know enough about the goings on in asia and africa to be able to think about the future of worldwide christianity.
The things I can predict:
- Liberal mainline protestantism in the US fails to be organizationally viable by the end of the 2030s. Endowment money coming from the boomers will dry up once their estates start getting carved up as they die off more and more. The mainline has already been in rapid decline since the 70s, but without the boomer money existing anymore, they'll go from the contraction we've been seeing to total collapse as viable organizations. We may see an end stage of this where many of these churches that are in altar and pulpit fellowship finally collapse into a singular organization, before finally running out of money and having to sell off all assets.
- religious "nones" plateau by mid century and start declining as time wears on due to acceptance of antinatal practices among the irreligious
- the conservative mainline (like LCMS, NALC, ACNA) slowly dwindles out by the 2050s. it's members either being attracted to evangelicalism or catholicism.
- The evangelical megachurch movement causes problems for itself by over-consolidating smaller churches, leading to a situation of organizational brittleness. A handful of scandals are used by inimicable organizations to cause large, over-consolidated megachurch orgs to bankrupt and die. This leads to a resurgence of very small, very ideologically diverse evangelical churches by the 2050s or 2060s.
- Catholicism becomes the 21st century "mainline" by the 2040s. Not in that it is liberal or heretical, but in that it has wide appeal and becomes the default mode of religious thought in the US.
- Zoomer tradcaths, coming into the church in an unbalanced number to women, end up causing a US vocations boom, with lonely zoomer men swining towards clerical and religious vocations. Meanwhile, millenial tradcaths brought their wives in with them and cause a laity boom with gen alpha. This is how the above line item occurs. A concomitant laity boom may happen for the evangelicals, but without a place to put "lonely men", evangelicalism doesn't see the same vocations boom.
- MENA orthodoxy and catholicism make overtures for unionism due to the instability and oppressive character of the region against the christian faith, with mostly the non-chalcedonians wanting to stay away from union in order to preseve their historical character.