Why do Bible only Christians say Catholics shouldn't pray to the Saints because they are dead people?

Then in the next breath they berate Catholics for the crucifix because they say. "HE is risen!". Yes he has risen but, did you not know that Christians are members of the body of Christ and if he has risen then we have too so upon death we will go to Heaven to be with him. We are not in the grave sleeping. We have consumed the body and blood of Jesus. We are of his body therefore we do go to Heaven therefore the Saints are not dead but, in Heaven. Therefore we may pray to them and ask them to intercede for us. Doesn't it say that "All of Heaven will rejoice over one sinner who repents"? Why would it say that if there were only Jesus and a few angels there?