I went to type "mainline denominations" into Google a few moments ago.  Here's what came up as Google's first suggestion:

This is problematic.

Here's a series of articles I've written on why we should take this stuff seriously:

Killing Church Committees and Other Reflections on Church Organization

Taming the Chihuahua Brain

Killing the Whispers and Other Reflections on Church Decision-Making

Crack Addiction and Church Transformation