The content of websites and other electronic communications may be harmful, distasteful or offensive for a variety of reasons. Most states have enacted law that place some limits on the freedom of speech and ban racist, blasphemous, politically subversive, seditious or inflammatory material that tends to incite hate crimes. This is a sensitive area in which the courts can become involved in arbitrating between groups with entrenched beliefs, each convinced that their point of view has been unreasonably attacked. In England, s28 Crime and Disorder Act 1998 defines a racial group, following Mandla v Dowell-Lee (1983) 2 AC 548 (in which a requirement to wear a cap as part of a school uniform had the effect of excluding Sikh boys whose religion required them to wear a turban), as a group of persons defined by reference to race, color, nationality (including citizenship) or ethnic or national origin; and a religious group as a group of persons defined by reference to religious belief or lack of religious belief. Therefore, it is equally an offense to show hostility to a person who practices a particular faith as to a person who has no religious belief or faith.
Source : wikipedia