We never really put enough effort into this question. I remember some time years ago when the most popular feature on BeliefNet was the belief-o-matic that matched your theological preferences on a quiz to one of the popular denominations with a percent, but even that didn’t come close to making sense of the variety of peoples experiences and preferences. Why is it that an ELCA Lutheran Church has way more in common with a Presbyterian PC(USA) church than it does with a LCMS Lutheran Church? There is soooo much more that unites and separates us than doctrine and theology.