The religion questions considered by The Big Question so far this series are:

17-04-04 What is religion?
24-04-04 What does it mean to be religious?
05-02-05 Is too much religion bad for you?

Also on Open2.net
Civil War - discover the detail behind the religious and political conflict which saw Britain execute its King and become a Commonwealth

Courses
If you'd like to take your interest in this area further, the Open University might have a course for you - regardless of where you live. Many OU courses are available worldwide, making use of the web, email and electronic conferencing. The exact range of courses available to you will depend on the country in which you live.

For a course which compares six of the World's major religions, you might want to consider World Religions. This is a level two course, which means it is fairly advanced and it's recommended that you complete An introduction to the humanities before you start.