I am fairly certain that in the first photo the tall man on the right is one of my first cousins on my mother’s side of the family. The Amish require that both parties to a marriage be baptized within the church.
For one thing, women have to “submit” to a lot more than men do, including deferring to the husband’s authority.
Of course this also depends on the nature of the person joining, but one basically cannot be resistant to “submission” of the Amish religion and way of life and still be accepted into the Amish community.
From what I understand, he had a fairly easy time of integrating into the community, most likely because he had Amish in his heritage — even his name is Amish-sounding.
If I can get a sense of how he is presently doing, I will post it later.
So, growing up in the outside culture would make it a lot easier for you to say, “Good-bye” and walk away.