Non-theist here
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I have found it useful to have a HP that is true according to my experience. For me the reality of cause and effect is something that I cant escape. So I made it one of my understandings of a HP. What I can escape from is other peoples understandings of a HP, Bill W's included. Its easy for me to change my mind on mystical or mythological powers. But I cant change the fact that cause and effect exist. Sure when I was drugging I could become delusional about causation, especially my part in it. But I don't want to have a HP that reminds me of my past delusions in active addiction.