As a missionary in Hungary in the late 1990s, my companions and I were often asked, “Why do I need to attend church? I believe in God, I worship him in my heart–why isn’t that enough?”
Of course, we trotted out answers, including Moroni 6:5-6, about early church members meeting together to fast and pray for the welfare of others, or the need to meet together to renew our covenants through the sacrament. But mostly these ideas seemed nebulous to these would-be investigators and rarely satisfied them.