Believing in those things makes life a little trickier. If a person doesn't believe then that is one less thing to worry about. If a person does believe then he/she must discern hallucinations and delusions from spirits and magic. If spirits and magic are real, they probably can induce a psychotic state in the experiencer. That person might experience psychosis and psychic phenomena at the same time. It would be hard to discern. Regardless of what is truly reality, it is simpler to be a skeptic.

I agree with what you say about knowing people. I have heard that spells require lots of effort. People don't invest that much effort unless they care about the person. My therapist might theoretically cast a spell on me, because she cares about helping me, but she has many patients besides me. So even if my therapist knew how to cast spells, and even if spells worked, she probably wouldn't have the time to invest casting spells on me.

I hope believing in magic and spirits is working well for you. I don't fault you for believing in those things. I have memories that might make me believe, but then I become paranoid about every little thing. If a sock is missing from my laundry, I begin to suspect somebody is using magic to tease me. Hopefully you have more discernment than me - I'm sure you do actually.