Every year some two million people from all over the world visit St. Paul’s Cathedral in London. It is well worth the admission fee to experience the magnificent structure designed and built by Sir Christopher Wren during the late 17th century. But tourism is secondary at this place of Christian worship. A primary mission of the cathedral is “to enable people in all their diversity to encounter the transforming presence of God in Jesus Christ.” If you want to tour the building and admire the architecture, you must pay an admission fee. But there is no charge to enter and…