When we pray to God the Son, Jesus you also pray to God the Father. Only Jesus is our intercessor to the Father. Not Mary, not the Pope, not some priest, not some saint, or uncle Joe.
Hebrews 7:25. "He is able to save forever those who draw near to God through him, because he always lives to make intercession for them".
What is intercession?
The meaning of intercession is wrapped up in the phrase "draw near to God through him". As a "creature" (Heb 4:13), you cannot come to your Creator unbidden. Furthermore, because the Creator knows his creatures utterly, they are "naked" before him. All their thoughts and deeds are laid open and bare before his eyes. You and I should be ashamed, indeed terrified, to come before God on our own, even if we were bidden. Therefore we need Someone to intercede for us. The Macquarie Dictionary gives this definition: "intercede ...to interpose on behalf of one in difficulty or in trouble, as by pleading or petition..."
Who is able to intercede with God for us?
Jesus Christ is able to be our go-between who can speak to God on our behalf. We can then "draw near to God through him" (Heb 7:25). The prophecy about Christ stated that "He himself bore the sin of many and interceded for the transgressors" (Isa 53:12). It stands to reason that someone who is in much the same position as ourselves, someone who needs an intercessor as much as we do, is not qualified in his own right to intercede for us.
There is only one priest among men who can can go to God in his own right and intercede for us, who himself does not need an intercessor. That man is Jesus Christ. That’s one reason why he said, "I am the way, the truth and the life; no one can come to the Father except through me" (John 14:6)
My Father, who has given them to me, is greater than all, and no one can take them out of the Father's hand. The Father and I are one." The Jews again picked up rocks to stone him.
Jesus answered them, "I have shown you many good works from my Father. For which of these are you trying to stone me?" The Jews answered him, "We are not stoning you for a good work but for blasphemy. You, a man, are making yourself God."
Even the Jews understood that Jesus was saying he he was God with the words "The Father and I are one". They were ready to stone him for saying it.