I understand what you are saying John, but why would that change anything?
Vicars, Peers of the Realm, and Felons in prison can't vote.
Vicars, Peers of the Realm, and certified lunatics can't sit on juries.
Unlikely bedfellows in both instances, but all part of the rich tapestry that makes up our national structure.
I think both prohibitions stem from a consideration of matters of conscience, and also from a time when the Vicar would represent real political power in local affairs, rather than from any technical consideration.
(N.B. As Kim says, all of this is fluid. The Crypto-Communists are busily tearing down our national fabric)
Cheers, Steve