很棒的问题。Episcopal 在亚洲只有在台湾有。It was organized after American Revolution, 这个宗教比较forward thinking,想法和别的宗教较前卫, 学校的宗旨大多是college prep, 我觉的正是这个原因,他们的学术,师资和生源要比较好。但和 independent school 比起来,他们还是要上圣经课。
Episcopal or Anglican Church is the Church of England. When the Catholic Church ruled the most of Europe, the Kings of England decided to revolt the authority of the Catholic Church and found their own church in the sixteenth century.
Episcopal Church has a very strong tradition of emphasizing on human reason, while understanding that is a true gift from God, as a tool to reveal God's grace and works in human history. Therefore, any episcopal schools and academic institutions tend to focus on academic success which encourages human curiosity and reason power. No wonder to see many great universities in England starting from this Anglican tradition.
Episcopal schools, private and secondary schools in USA, England, and other countries continue to foster this tradition and have been known for their academic strength.
Religious schools tend to offer more ethical education based on their religious belief along with academic curriculum. The type of their ethical/religious education at religious school varies. I recommend students and their parents to look into schools carefully before making the final decision.