Question: There is a group of people residing in a neighboring valley called Umm Al-Safaa’. At the beginning of every summer, they purchase a bull or a cow and slaughter it at Al-Safa’. This happens every year, at the beginning of summer. I see this as an act of Shirk (associating others with Allaah in His Divinity or worship), because they slaughter this animal to those who live in the valley from Jinn and devils, and other superstitions.They do this at the beginning of the year in one specific place. If it was done anywhere, it would not be a problem, because it would be done for Allaah. What is the ruling on this practice? Is it an act of Shirk? If not, why not?
Answer: If the situation is as you described and they offer sacrificial animals in this valley for the Jinn, it is a major form of Shirk that takes the person who performs it out of Islaam. Allaah (Exalted be He) says (what means)… read more here.