You're looking for protestant composers without prominent vices. Handel, maybe, though he did have a temper. You could check a Lutheran Hymnal and find out who (other than Bach) wrote or arranged their hymns. You could try Arvo Part, if it doesn't bother you that he switched from being a Lutheran to Eastern Orthodox (not Catholic, but maybe you're not keen on the Orthodox either). Haydn is probably OK by your standards, possibly even Beethoven, Brahms, Mendelsohn, and Stravinski (again, not sure about your feelings towards Eastern Orthodox). Messaien, too, might be OK. It sort of depends on what failings you are willing to tolerate (surely you have a few yourself) and how explicitly Christian their writing must have been.