You're right, Parson -- it should be "well". But, with all due respect to your parishioners** I doubt they will be debating niceties of grammar after the sermon, so use which feels most natural for them. Or you could say "fine" or "for the best" and avoid the dilemma!
** coming as they do from a nation in which individuals can say "I'm good" when their moral qualities aren't in question, just the state of their coffee reserves...
** coming as they do from a nation in which individuals can say "I'm good" when their moral qualities aren't in question, just the state of their coffee reserves...