Hello Tyron,The Christians who speak about talking to the dead are saying things the church teaches. I wouldn't believe anything the church teaches. It's heavily invested in furthering its own agenda, and it's all Earth based. You won't get truth until you abandon the church and come to the Higher Power on your own.
Read what I wrote about Yeshua and the afterlife at this link: http://adcguides.com/yeshuaonafterlife.htm
And don't listen to the Christians who talk about demons speaking to mediums. It's superstitious nonsense.
Love and peace, Craig