From Tactical Wire:

A true or genuine Church/Synagogue Security program must be deliberately organized and coordinated to have any hope of being an effective deterrent or solution to an attack on the innocent people inside.

We cannot just expect that off-duty police officers or CCW permit holders who happen to be members of the flock are going to assume the mantle of security just because we would like them to do so. Security must be deliberate and purposeful, not an afterthought, if it is going to be of any use.