Megachurches are predominantly white, suburban, conservative congregations led by baby-boomer pastors. This is what an infographic about floating around the web lately has revealed. It's based on research compiled by Forbes, The Christian Post, and Leadership Network.

For the most part the stats look very positive for mega and gigachurches (yes, that is a term now being used). These massive congregations, unlike many other churches, are still growing. They're expanding staff, seeing increasing budgets and have an optimistic outlook.

But buried in the positive stats about megachurches may be signs of challenges ahead. Could a bubble be forming? And when it finally bursts will the mega-model be abandoned or severely reengineered? Are we seeing the maturation of the megachurch movement into a sustainable and long-term model for the American church? Or, like Wile E. Coyote, is the ground going to suddenly disappear under its feet? Let's look more closely at the numbers.

First, the average age ...