“Reiki and the like give me a bad vibe, and they possibly could be Avizrayu D’a”z, but would I reject a shidduch with someone who’s family does it? I’d be rejecting quite a significant part of Klal Yisroel. (Lakewood b’sochom)”
You certainly should reject a shidduch with a person who does it, as that person would themselves be either a baal avoda zara or a mechashef. During different eras there were significant portions of klal yisroel who were literally involved with Avoda Zara Mamesh. Had you lived during those times would you not reject a shidduch because “a significant part of klal yisroel do it?”
This thread is like the embodiment of the expression “If you lay down with dogs you wake up with fleas”