Classification systems express an idea of the world as it was when the systems was made. If the classification system is not revised there is a possibility that the system will become antique and hard to apply to different subjects. The purpose of this study is to see if the SAB-system is a classification system which shows a reflection of the subject Religion that is equivalent with that of Swedish universities. The ideas which are behind the classification of the subject religion in the SAB-system have been analysed, as well as the structuring of the scientific discipline Religion at the universities. The result will show if the SAB-system can classify the subject religion in a satisfying way at university libraries. A hermeneutic scientifically view to analyse the material have been used. Literary studies have been used to get the result. Other sources of information are the websites of the universities, where each university´s view of the discipline can be obtained and where the information of what literature are used at the courses are given. The structuring of the SAB-system of the subject religion bears a certain resemblance to the universities` view of the subject as long as the universities use the traditional view of the subject: Christianity verses other religions. However, the trends are that universities, in their education, more and more mix up different cultures and religions, and that the courses become more interdisciplinary. Another difference is that the SAB-system gives big space to the Swedish church, which the universities do not. The SAB-system works well as long as the universities have a traditional view of the discipline. The system has difficulty in classifying the subject when the universities try to look at the subject out of a pluralistic view of the society where different religions meet.