Are megachurches actually reaching new people for Jesus, or are believers gathering into ever-larger groups, leaving crumbling smaller churches in their wake? (A phenomenon commonly called sheep-stealing or sheep swapping.)
Megachurches keep getting bigger while small churches seem to struggle more than they used to. Since these two phenomena are occurring at the same time, it’s easy to think that one (megachurch growth) is the cause of the other (small church struggles.)
My take is that, while the two are related, it’s not a direct cause-and-effect.