Here's a comprehensive summary of the Wikipedia article on Amish religious practices:

Amish religious practices, deeply rooted in traditional Anabaptist Christian theology, center around worship services held every second Sunday in private homes rather than dedicated church buildings. These gatherings, conducted in a mix of Standard and Pennsylvania German, feature sermons and scripture readings from Martin Luther's German translation, interspersed with very slow, unaccompanied hymns often drawn from the 16th-century Ausbund hymnal. Leadership roles—including ministers, deacons, and bishops—are selected by lot from nominated congregational members, serving for life without formal training.

Sundays are strictly observed, prohibiting most work, purchases, and the hiring of motor vehicles, except in emergencies. Uniquely, Amish congregations are defined by the physical location of 25-30 neighboring families, fostering profound, long-term relationships and a strong sense of community since "church hopping" is not practiced. Following services, members share a communal lunch and socialize, with families rotating hosting duties and transporting shared church property like tables and chairs.