In Pakistan the supremacists are Muslims, and those considered "unclean" are Christians, in accord with Qur'an 9:28: "O you who have believed, indeed the polytheists are unclean...." This is considered to apply to Christians because of the Trinity.

"Sentenced to death for a sip of water: As her religion faces persecution across the Middle East, a Christian woman explains why she faces hanging in Pakistan for the crime of ‘blasphemy,’" by Asia Bibi in the New York Post, August 25 (thanks to Pamela Geller):

To her neighbors, Aasiya Noreen “Asia” Bibi, a poor mother of five in the tiny village of Ittan Wali in central Pakistan, was guilty — guilty of being Christian in a nation that is 97% Muslim.

For four years she...http://www.jihadwatch.org/2013/08/im-a-prisoner-because-i-used-the-same-cup-as-those-muslim-women-because-water-served-by-a-christian-.html