ANSWER:

Your father is committing shirk and he is not Muslim. 

However, whatever food he gets, this is halal for you to eat from and the sins are on him. 

QUESTION: My father is a Sufi who does spiritual healing (_dam_) and gives amulets (_ta’weez_) using words that ask for help from spiritual elders. He also does numerology for homes, businesses, and past/future events. I believe these practices are incorrect. He doesn’t charge, but disciples voluntarily give him money. Is it _halal_ to eat food bought with that money?