Aslaamualaikum.
If a Muslim, due to Lack of Islamic knowledge and understanding about the soul after death, verbally says and believes that the soul/spirit could come back to Earth after death to wonder around Earth, visit families and complete unfinished business, take revenge against people that have killed them, come back because they died or got killed because they didn’t get married to their true love, haunt their killers/enemies/evil people etc and other similar statements.
If due to Lack of Islamic knowledge and understanding and due to Ignorance the Mulsim(mentioned above) does the above thinking, verbal sayings, maybe belief or any of the above make the above Muslim a kaafir?
Shukran