Can you give me any evidence that God does everything himself? Granted, he is omnipotent but has used people and angels throughout. Read the Bible. God sends his angels and they obey. God sends his prophets and they obey and God sent His Son. If you'll read the prayer you'll see who I think is in charge.
You are the one that PRAYED to one and that calls one "saint" the onus is on you to show that indeed God intended for you to have them pray for you.
The fact that one asks for proof that "God does everything " is a bit troubling. What can he NOT do?
Does He use people and angels, but where does it say that angels are to be a prayer intermediary?
I am just looking for something beyond superstition