High Inbreeding
Although the Amish do not marry their cousins deliberately, their families are at high risk of inbreeding. Because Amish families are small, they do not have many options to marry another Amish person.
No Recruits
The Amish’s aversion to evangelism is another intriguing feature. They have a long history of shutting out non-members and isolating themselves from modern society. It’s no surprise, then, that the Amish refuse to recruit. Moreover, the Amish’s most ardent supporters are unable to become members of the church.