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In practice I am not sure it is so easy to say "no thanks" to your adult baptism and abandon everyone and everything you've known up to that point.

It is difficult, but not unknown. The documentary Devil's Playground features several Amish who permanently left the church.

And also, sadly, many Amish flee physical and sexual abuse: https://duckduckgo.com/?q=Amish+abuse&ia=web

Of course it happens, but I would guess many stay with misgivings.

Point is it’s virtually impossible without turning your life around and start from nothing in different place