Again, not so. Since you have begun the practice of using insults, I will throw it right back at you and say you are not only the ignorant one, but naive as well.
The general belief that one can communicate with the dead is spiritualism and it has all kinds of shapes and flavors. Many people go through a medium because they don't have confidence in their own abilities, others may feel more comfortable in a group setting and participate in seances, but there are also many, many individuals who attempt to contact the dead on their own.
Whatever form it takes, contacting those beyond the grave is unhealthy even if one claims to be communicating with a christian. There is no reason to think that anyone beyond the grave has clout with God concerning what goes on here on Earth. Mixing it up with those beyond the grave invites confusion about what it is to be walking in Christ.
When you're going to pray to somone in the spirit pray to God. Jesus opened up the way for believers to approach the throne of grace and that's superlative news and what the Book of Hebrews is all about. God is more than able and there's no reason not to, except for a mistaken belief that you, if a believer, are barred from His presence.