Question

William Penn referred to his colony as a “Holy Experiment” because

Answer 1

Because in his colony people were free to practice any religion they wanted. there  were no restrictions

Answer 2

William Penn referred to his colony as a "Holy Experiment" because in his colony people were free to practice any religion they preferred. There were no restrictions and everybody had to live in harmony. Immigration also had no restrictions and people from other places could easily come and settle there.