For the OPC, Jesus is a lesser or messenger god to God the Father, much like Mercury was the messenger of Jupiter in the Roman Pantheon of gods. This is not Christian.
Forgetting the crude analogy for the moment, can you find one instance in Scripture where Jesus claims to be equal to His Father?
JOHN 14:
28 You heard me say to you, `I go away, and I will come to you.' If you loved me, you would have rejoiced, because I go to the Father; for the Father is greater than I.
29 And now I have told you before it takes place, so that when it does take place, you may believe.
30 I will no longer talk much with you, for the ruler of this world is coming. He has no power over me;
31 but I do as the Father has commanded me, so that the world may know that I love the Father. Rise, let us go hence.
Yes, God did send his Son to earth for a single purpose.
John 3:17 For God sent the Son into the world, not to condemn the world, but that the world might be saved through him.
How about Matthew 28:19?
The problem is with your question, not with the Catholic answer. You see, the problem with simple people self interpreting is that you get over simplified interpretations.
There is a significant difference between saying there are three consubstantial hypostases in the Trinity, and there are three co-equal persons. Jesus is not equal to the Father, Jesus is God, as is God the Father and God the Holy Spirit.