Is believing a sorcerer's words considered disbelief, even if what he said is not acted upon? And is a mother considered to have committed an act of disbelief if she gives her husband pills prescribed by a sorcerer? And what is the ruling regarding a relative who went to a sorcerer?

The condition of the healer must be investigated. If it is proven that he is a sorcerer, then it is not permissible to go to him, nor to believe his claims or pretensions to the knowledge of the unseen, because that is disbelief in what was revealed to Muhammad. However, the default is for a Muslim to remain in their religion and not be declared an infidel. There is no prohibition against using proven herbal remedies, and they are not necessarily from sorcerers. Furthermore, believing the sorcerer, which is condemned in the hadith, is limited to believing his claim of knowing the unseen, not believing him in medical treatment matters, as evidenced by the actions of Aisha and Hafsa, may Allah be pleased with them, with their slave-girls who had bewitched them.