ANSWER: No you must not. There’s no concept of sacrificing black animals like this as it’s a superstitious belief and can mount to shirk. Most likely such people are sacrificing for the jinn! 

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ANSWER: It is not kufr as long as he doesn’t believe in it. However, he is sinful for telling him as there is no benefit from that except for those who believe in it. 

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ANSWER: No problem in working in a halal department there as this is not fortune telling. 

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