Pakistan is an Islamic country , I just guess they run out of stones to throw and went on acids ,or they just wanted a more creative way to torture people.
But it is still the same...torture and murder.
Don't forget ,there are many Islamic "mathaheebs" which are "ways" sort of, like Sunni and Shia'a and way many others.
But the Sunni and Shiaa are the most famous ones.
Just like Christianity and Catholic.