@Bill_W - They are not talking about chartering in the way a BSA unit is chartered. What they mean is a religious group that is supporting a Girl Scout troop by providing a meeting place, adult leadership and perhaps even funds. Such a sponsoring religious group may not insist that the girls in the troop take part in any religious observances.
In reality, Girl Scout troops rarely need financial support, because it is so easy to raise money through the cookie and fall product sales. The registration fee is only $25 per year, and the troop often has enough money to pay for that and the uniform as well as all program costs.
Some older-girl troops may need to raise money, if they want to take an ambitious trip. For instance, a Trailblazer troop in my service unit is planning to go to Switzerland. Also, some older gilrs may need to raise money to participate in nationally-sponsored Girl Scout Destinations. Some of these are affordable. But there is one next summer called Cuisine & Culture of Northern Italy that costs $4,900. Usually, girls sign up for Destinations individually and not as a troop.