Faith CoLab: Tapestry of Faith: Building Bridges: A World Religions Program for 8th-9th Grades

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Religion Facts has a short biography of Martin Luther. Squidoo has a lay person's interpretation of the Theses, line by line.

The Catholic Resources article Who Are Christians? has an overview of the branches of Christianity.

Read more about Congregationalism and Calvinism at The Congregational Way and Basics of Calvinism.

Church Year is a good source for information on Catholic holy days and the liturgical calendar.