Largest Christian congregation on Earth
When I think of a mega church, numbers like 20,000-50,000 people come to mind. Yet, it came as a big surprise to me that the largest Christian congregation on Earth, Yoido Full Gospel Church in South Korea, has 830,000 members! One in twenty residents in Seoul is a member! My mind has difficulty comprehending what it takes to run such a huge body of believers.
But the answer is simple - small groups (or cell groups). These have basically become the modern version of house churches that existed in the early times of Christianity. No matter how large the church becomes, we are not capable of handling more than 20-30 relationships at a time. I can imagine that in churches like Yoido Full Gospel, small groups become primary place for learning and discipleship, as not every member can make it to Sunday service and at best can only view it on TV.