Simple history of Replacement Theology 101
As for dispensationalism well that goes farther back that John Darby also:
maybe you were thinking Justin martyr?
or
Darby but again he was not the first, he just had his own little twist, Darby 101
So, I guess, like others here I do not understand what the heck you are getting at regarding the Amish. People have believed in replacement theology and killed millions of other Christians including millions of Jews in justification they are now the one true children of God, and Israel is no longer the apple of God's eye, but this is easily debunked using scripture. As for dispensationalism, people, pastors and priests and common men and women have been believing in this since the first century AD, or for non believing folks C.E.
You do understand that Anno Domini suggests
shalom b'SHEM Yah'shua HaMashiach
that YHvH did not exist before 0(zero) CE. Anno Domini
It seems less blasphemous to use
ORIGIN mid 16th cent.:
Current Era and Before Current Era.
The New Testament teaches that Christianity is the sole continuation and that Jewish nonbelievers are cut off. Rabbinical Judaism is based on the post-Messianic Talmud scripture. It teaches that non-Christian Jews are the sole inheritors and rejects Christianity as polytheistic. For 1800 years there was never a doubt among Christians as to their own inheritance until John Darby came along to concede the argument in favor of non-Christian Jewish inheritance.
The term "replacement theology" is an artifice used to disguise the real issues at stake. If Jesus was not the Christ according to prophesy and His own words, that would make Him an impostor and Christianity a misnomer.
Jesus DID tell the truth about Himself and His Gospel is the legitimate continuation of OT religion, not a replacement. The Jewish Apostles clearly lived and died for the belief that Jesus DID come for them. Darby's Dispensationalism trades in this inheritance for a mess of pottage.