In modern Western culture we've killed God and I think we're learning what the consequences of that mean.
People left the church because it was stuck in a obsolete understanding of the world and did not offer people satisfactory answers to their questions. Past a certain point, if a religion wants to survive, it must renew itself, otherwise it risks becoming irrelevant. I bet there would be more people in church if the pastor said: hey, forget about the Bible, forget about the angry, prideful and violent "man in the sky"…
It generally doesn't work, because you can be present in the moment playing golf or sleeping in much more easily. if you try and make a chess club essentially without chess, why bother?