The survey needs be taken that would corelate ALL types of individuals - unchurched, churched, how LONG they've been a believer in that church, etc.
It would be almost a 3D matrix of data to be mined.
It is called corruption, and is common to every religion and every other grouping of humans, and has persisted from the beginning of human history.
Anyone who pushes for a "biblical" form of government, or a "religious" form of government, is corrupt, insane, or ignorant to the max.