Q. Do I need to go to church since I can find fellowship online?
A. What a great question! I've often wondered what the apostle Paul would think of our Internet-driven world populated by blogs, chat rooms, and instant messaging. Imagine his letters to the various New Testament churches. Instead of the "letter to the church at Ephesus," he might have written "the multiple e-mails to the church at Ephesus." And rather than wait to address a problem when he was able to visit, Paul could have sent an instant message.
There are some tremendous advantages to the way the Internet has expanded our communication abilities. It's given us relational access to people with whom we never would have crossed paths otherwise. In Paul's day, it's likely Christ-followers from Ephesus never spoke to any of the Christ-followers from Philippi. Today that connection is just a click away. Christians all over the world now can encourage and learn from each other.
But, getting back to your question, it's important to note Christian fellowship and church services are two very different things.
Church services are, by design, not terribly effective at promoting fellowship or community in the relational sense. Instead, their purpose is for the larger group to have centralized biblical teaching and corporate worship.
Fellowship often happens when people are in smaller groups or involved in one-on-one relationships. It's in this context we work out our faith by becoming more loving, patient, kind, and truthful. And it's critical that the physical church provide space for this to happen. Part of what makes the body of Christ so unique is the corporate gathering. That was true in the New Testament churches, and it's true for churches today. The Bible disagrees with those who say they can follow God without attending church. Scripture tells us "not to forsake the assembling of ourselves together as some do" (Hebrews 10:25). So online Christian fellowship cannot be considered a viable alternative to church services.