Many books now tell us what to eat or when not to eat, how to observe “sacred times” or generate mystical experiences, but in Christ we sever both our bondage to the world and our tendency to think that a guru’s orders will save us. Ruben Rosario Rodriguez’s “Calvin for the World” takes readers on an unusual look at John Calvin as “a humanistic reformer whose ecclesiastical and civil polity wanted ‘every resident of Geneva integrated into a caring community,’”