What religion was colonial Pennsylvania?
The religion Colonial Pennsylvania was made for was the Quakers.
The above is somewhat of a half-truth. Yes, Pennsylvania was founded by William Penn, who was in fact a Quaker, but Pennsylvania was not created solely for the Quakers (Society of Friends). Penn viewed his colony as a "religious experiment" where any and all religions were welcome. Of the many that prospered here, German Reformists, Calvinists, Moravians, and Mennonites remain some of the more well-known during the colonial era. To answer your original question, Colonial Pennsylvania did not have an established church, but instead was considered a place where anyone could practice their faith freely.