So the Catholic Church deeming who is a Saint and who is in heaven is judging what is holy?
Christ instituted the Holy Catholic Church. He gave the keys to Peter and through the inspiration and protection of the Holy Spirit protects her from error. If a panel of judges decides that a miracle has occured it is declared worthy of belief. You can choose skepticism or faith. As for determing who is a Saint, God has already chosen that person. They have entered heaven and that fact has been revealed. The Church doesn't decide who is a Saint. God does.