Are Christians just like mediums really?
Christians are not like Mediums. Mediums attempt to contact the spirits of dead people or people from spirit worlds. Christians do not believe this to be possible without some type of demonic intervention, which is offensive to God. Christians believe there is one God in Three Divine Persons. We can speak to him because he is personal. He is eternally True. Speaking to the Eternal Living Creator of all things is not the same as speaking to a (dead) created spirit or created demon. You should try to speak to Jesus in humility and see what He says.