Amish: None, because they don’t use light bulbs.
Anglicans: One.
Baptists: One.
Branch Davidians: One.
Calvinists: One.
Catholics: One.
Christadelphians: One.
Christian Scientists: One.
Gnostics: One.
Jehovah’s Witnesses: One.
Lutherans: One.
Methodists: One.
Orthodox Jews: One.
Pentecostals: One.
Presbyterians: One.
Rastafarians: One.
Seventh Day Adventists: One.
Wesleyans: One.