Note: You are talking of Saint, Capital S which refers to one that it is kosher to pray to because the Church is certain that they are already in Heaven (no purgatory for them.)
This in no way denies the reality that we are All called to be saints, little C, and that we ALL hope to be in heaven one day.
Why do you only hope? Why don't you know?
Wasn't what Jesus did once and for all enough?
Jesus isn't enough?