When we use the word "advocate," in this sense, we are saying that she advocate, our causes and petitions, before her Son. If I asked you to pray for me would you not be advocating before Christ for my petitions?
If I was to ask you as one still here under the Sun we would be seeking to lift each other up . If we were to seek the dead for us living under the Sun ;Then I would be seeking (necromancy) after a disembodied worker with a familiar spirit or what you must call a patron saint and scripture defines as a abomination.
We seek after the Father as the one authorized manner clearly called "This manner". Not after our brothers and sisters in Christ who are asleep waiting for the wake up call on the last day .Arise and receive your promised new incorruptible bodies
Matthew 6:9 After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name.