As a side note, I wonder how many Amish the USA really has
They have lots of kids, they stay in the country, and don’t submit to government counting or services, so I doubt lazy fed.gov bureaucrats have an accurate count
Maybe in 100 years, America will wake up and find the country is mostly Amish.
There just aren't enough Amish to make any decent impact. Where you see a lot of growth is amongst both Evangelical Christians and Mormons, which is an excellent sign. World wide, Christian Nigerians are doing quite well.
The rest of the world, including the arab World, Africa, and Asia is rapidly cratering.
What to Expect When No One’s Expecting and How Civilizations Die (this one goes off the rails at certain points, but overall is useful insight) are both good primers on the subject.
It won’t be ‘Amish’. Not unless Amish gonna be speaking Spanish.
The Mormons have a total fertility rate of 2.8. That’s not spectacular but it means their population is growing even as the rest of the population shrinks. Given there are currently 8 million of them in the US vs about 370,000 Amish, it will still take the Amish a while to catch up even at 6-7 kids per Amish woman as is thought to be their birthrate.