It’s a long way and against scripture to make up the practice of praying to saints in heaven from “God is the God of the living”. There is a distinct difference in scripture of living on earth and “living” in heaven. No examples or reference is given in scripture of intercessors who have died and gone to heaven. In fact, specific instruction is given to pray to God only and that Jesus is our only intercessor.
Jesus is our only intercessor.
St. Paul disagrees with you on this:
First of all, then, I urge that supplications, prayers, intercessions, and thanksgivings be made for all men...