Not just churches. My sons pack was supported by a police department until ACLU intimidation forced them to drop it. The police officers were so angry at the result that they had their UNION pick up the charter :-)
As I understand it, there have only been a couple of packs nationwide that have disbanded because of this type of action by the ACLU, and they were marginal even before losing their sponsor. Most packs faced with losing their sponsors have no problem finding someone else...a church, a community group, or even a company, to become their chartering organization.
As much as the ACLU despises the Scouts, most Americans still support it. As long as that's the case, these packs and Troops will continue to exist.
Our Pack and Troop does not have a charter organization. For various reasons, we wanted to remain independent so we are chartered by "Friends of Pack 518" Guess who the "friends" are?
All the members.