They are very kind people but have some critical errors in doctrine. Primarily, they believe in works based salvation and their mindset of closing themselves off in their communities goes against the instruction to be a light unto the world and labor to wake other people up. Additionally, many of their communities teach non biblical folk magic and other secret teachings which is extremely dangerous to one’s salvation as God says to have nothing to do with it. Finally, many people who have come out of the Amish communities state that to many, the Amish lifestyle takes precedence over scripture which is idolatry. A fairly common occurrence in their churches is to only use German bibles in which nobody except the church elders can actually read and the young people don’t actually read any scripture. This is done because the older members don’t want the young people to read the Bible for themselves and come to the conclusion that they aren’t following Christ according to the Bible and then leave the community. All that being said, yes, country living is scriptural.