Religion cannot be reduced to affiliation. That's especially true today, when religion has become complicated for people. Dr. Robin has friends who chose not to be actively involved in a formal religion. However, she was raised as a Catholic, and he was Jewish, and these strong historical and familial influences constantly showed up as surprise guests in their lives. They thought they had rejected the religious affiliations of their parents, but when they became parents themselves, they found themselves automatically being drawn back. Naturally, this created a serious conflict about which religious influence would dominate their child's life. Because these were not dogmatic people, they eventually found a way to give their child the gift of a mixed religious heritage, but not every couple will find that possible. So when you're having a conversation about religion, open it up beyond affiliation, and find out what religion means to each of you.