Under no circumstances will I conduct any kind of test flight if I know that a priest is watching.
Twice I've been managing a flight test, a priest (military padre to be precise) turned up out of curiosity to see what was going on, and within 5 minutes we came within a hairs breadth of losing an aircraft. I mentioned this to a former boss of mine, who said "ah, yes, the padre was watching when I lost a Harrier".
That's good enough for me, won't do it.
G