I think that really depends on how you define religious and commune. There are lots of informal communes (hippy or otherwise) in the 5-20 person range all over the United States that have nothing to do with religion. More than enough people for a small homestead that shops mostly at a supermarket, but not nearly enough to have a few dozen men to spare to put up a barn which is kind of the bare minimum for sustenance communes like the Amish.

There's also a century of history of large kibbutzim in Israel that are somewhat religious but fundamentally organized around agriculture or industry.