Technically known as "poisoning the well," this is a great example of a question that assumes an incriminating falsehood ("start ignoring the direct access to the Throne of Grace") before positing the actual question. Of course, the time-honored exemplar of the kind is, "Have you stopped beating your wife yet?"
But to answer your question, Christians started "praying to dead Christians" for help once they realized that (a) there are no "dead Christians"; believers who have fallen asleep are alive in Christ Jesus and in the presence of God; and (b) the Church is the Body of Christ, whose bonds of charity are not sundered, broken, or destroyed by the power of death.
Ok, so if they are there in the presenced of God isn't kind of rude to ignore God and ask a favor of a lesser being?