Watch the steeples to see which old churches remain exciting on the outside. Austerity is not exciting. Early times energy, however, before somebody imposed their austerity on the first enthusiasts, is exciting. That is the criteria. Did institutional Christianity add to human enthusiasm for life, insights related to a founder's message; or did power grabs take over, fast.
Norwegian church styles: The earliest Christian churches were stave, built on wooden piers, and of wood; and stone.
There is a commonality of style to many 12th Century stone churches in Norway. The stone structures stayed firm, unlike the stave churches, wood, built on great wooden piers that usually rotted within 100 years, requiring rebuilding.
Both types, however, undergo style changes that detract from the original exteriors. Somebody plunks odd, skinny disproportional steeples on top of the Romanesque stone, as here at St. Olav's (Olaf-Olav, search both). Or the same misguided ascetics remove the dragons once under rooflines or at the ends of eaves, leaving a sadly austere structure that would attract noone with verve. Is that so? This is a steeple comparison site.
Here is the spindly steeple on venerable St. Olav's, to commemorate where the seeker of a united Norway, using Christianity as the novel ideology whereby the in-group could justify annihilating the out-group, as elsewhere in western cultures.