Is there a difference between a Mega church and a media empire? Is there a difference between Thomas Nelson publishing and McGraw Hill? Don't they all have marketshare and capital investments to protect?
How do we distinguish between a commercial lobbying organization and a religious lobbying organization? And if we cannot, what will happen? Exactly what has happened. Liberal religious organizations are going to lose in the marketplace of ideas because they are playing conservative game on a regressive field. They cannot compete unless they profit, and to succeed they must become what they are fighting against. Never play another man's game, he's better at it and he'll win every time.
When what most people consider religion is seen as the guardian of civic virtue it establishes itself as a conduit through which people relate to government. That's what the establishment clause is all about.