Talking to the dead

When you pray you are in direct communication with God / Jesus. The Bible warns us not to communicate with the dead because you can easily do it through Séances, Ouija Boards, Hypnoses, and when under the influence of drugs which the Bible calls Witchcraft. At this point you are not talking to any relitive who died you are talking with Demons who know everything about you and your family. There are also rare occurrences when God will send his Angles to talk to Humans.