What is the greatest sin that someone can commit? While many things may immediately come to mind, was one of your thoughts not sharing the gospel with an unbeliever? The world's population is growing, and what that means is that there are billions of people who have yet to hear the name of Jesus. Additionally, if we see things like attending church as optional, not only will we miss out on many spiritual blessings, but we'll likely also see sharing Christ as optional.