There is one problem such cults doesn't solve: The issue of population growth. To my knowledge amish people have tons of kids and because of that their culture is not sustainable in the long run.
Eitherway, my perfect culture would rather be that of some australian aboriginies. They banned technological progress. That ensured that their population would never grow into destructive levels.
Though it is a hard truth to swallow, we have to accept that children die as all other animals have to, if we are not to destroy the land we live off. Contraception could work, but natural contraceptions are either potentially dangerous (plants) or unpopular (intestines, doubt that there would be much feeling through it). Breastfeeding the kids longer also work, but it is in no way bullet proof so it is very likely that you will end up with at least 5 or 6 kids during a woman's productive years.
Many christian cultures deal with sexuality as if it is just to quit (the famous abstainance); like smoking. I don't know what the amish do, but that is definately NOT the way to go.
Most past cultures glorified war and warriors. War can be very much population controlling. Ergo; the juda-christian culture and it's relativly pacifistic culture is all to blame for this mess we are in.
Christianity is easy to believe, because it, just like politicians, promises things that remove us from the hardships of the real world. But in the long run neither can keep what they promise.
Torjus Gaaren