the Universal Declaration of Human Rights adopted by the United Nations in 1948 (http://www.un.org/Overview/rights.html), enunciates and enshrines the principles of freedom of religion and freedom of expression

In addition, over the past eleven years, the British government has passed a number of laws that specifically tackle, or include directly in their provisions, protection of the freedom of 'religion or belief'

Under this range of existing human rights and anti-discrimination legislation, everyone has the right to hold their own religious beliefs or to hold other philosophically-based beliefs deemed 'similar to a religion'.

They also have the right to have no religion or no belief at all!

for example, under the Equality Act 2006(http://www.opsi.gov.uk/acts/acts2006/ukpga_20060003_en_1),
it is unlawful for someone to discriminate against another because of his or her religion or belief OR because he/she has no religion or belief.

If someone threatens, abuses or attacks someone because of their religion or belief (or lack thereof), this may amount to what is called a 'hate crime' under the Racial and Religious Hatred Act 2006


The KKK, may indeed use religion as one tool among many to motivate terrorism against outsiders but essentially it is a secret, oath-bound, 'fraternal' organization (or a number of small independent chapters) whose avowed purpose is to protect the rights of and further the interests of white Americans.

In the UK -

In order to be protected under the Equality Act 2006, a religion or belief must be able to be generally recognised as being:

* cogent
* serious
* cohesive
* compatible with human dignity.

what constitutes, affirms or denies 'human dignity' may be subject to disagreement; but I don't think, under any circumstances, it could be said to include the KKK!