I used some of those spirit box apps. When I used them they mostly talked about getting food to eat. Well if you are dead that would be non linear so past and future dead would be in the same place! Global warming threat of no food to eat could be the point. Anyway if you are looking for god and wants to get in your head or get into others head or asks for a ship then you might want to think about things!
My view is that if you did not go to heaven then... Sort of like not being graduated from college, dropped out low IQ. What was the education from a person that died in their time vs today or future. All societies get brought up in time. Just what time!