Here are three godly sorts that I've painted up for my Pike and Shotte collection. The Puritan and the Anglican are from the Warlord Games ECW range, although I will be using the latter as a Catholic since I suspect Anglicanism are pretty scarce on the continent.
The Calvinist is the only one converted at all; I added a plastic sheathed sword from the P&S infantry box. I know some might point out that the black-clad Puritan image owes more to popular culture than history, because black cloth was quite expensive at the time, so English nonconformists preferred cheap simple brown/russet fabrics to demonstrate their humility and practicality. But I see this Calvinist as a wealthy burgher from Krakow or Gdansk or someplace, not necessarily tied into the cultural signalling of English Puritans specifically. Also, black looks cooler.
The beardy Orthodox fellow is an Assault Group freeby miniature that can be included upon request with orders above a given size. Or if you forget to specify a freeby for a qualifying order, and your order mostly consists of Cossacks and Muscovites, they'll probably pick this guy out as the most appropriate freeby anyway. That's why I have another of these guys waiting in the wings, as soon as I can decide on a contrasting color scheme.
For those of you interested in package deals, Warlord Games sells a "Fire and Brimstone" set with three clergy types, but I passed on that since the ranter doesn't really fit my setting, as nifty as the miniature is...