Scripture very plainly says, “There is one God, and one mediator also between God and men, the man Christ Jesus” (1 Tim. 2:5). Nonetheless, the Catholic Church insists that Mary is her Son’s "co-mediatrix.“2 And in the eyes of millions of Catholics, what the Church says is seen as the final and authoritative Word of God. First Timothy 2:5 is thus nullified by Church tradition.”
Catholics agree that scripture tells us that there is only one mediator. But you are taking 1 Timothy 2:5 out of context. Scripture also tells us that there is only one Foundation, only one Lord, only one Judge, only one Father, only one Teacher.
But we see that Moses, Abraham, and Job were examples of mediation and intercession between God and man, plus praying for one another here on earth is an example of mediating between man and God.
Scripture tells us there is only one foundation Christ
1 Cor 3:11
For no man can lay a foundation other than the one which is laid, which is Jesus Christ.
But Scripture also tells us:
Eph 2:19-20
So then you are no longer strangers and aliens, but you are fellow citizens with the saints, and are of God’s household, having been built on the foundation of the apostles and prophets, Christ Jesus Himself being the corner stone,
Rev 21:14
And the wall of the city had twelve foundation stones, and on them were the twelve names of the twelve apostles of the Lamb.
Scripture tells us that there is only one lord:
Eph 4:4-5
There is one body and one Spirit, just as also you were called in one hope of your calling; one Lord, one faith, one baptism,
But scripture also says:
Rev 19:16
And on His robe and on His thigh He has a name written, “KING OF KINGS, AND LORD OF LORDS.”
1 Peter 3:6
just as Sarah obeyed Abraham, calling him lord, and you have become her children if you do what is right without being frightened by any fear.
Scripture tells us that there is just one judge Jesus:
James 4:12
There is only one Lawgiver and Judge, the One who is able to save and to destroy; but who are you who judge your neighbor?
2 Tim 4:1
solemnly charge you in the presence of God and of Christ Jesus, who is to judge the living and the dead, and by His appearing and His kingdom:
But Scripture also says:
1 Cor 6:2
Or do you not know that the saints will judge the world? If the world is judged by you, are you not competent to constitute the smallest law courts?
Lk 22:28-30
"You are those who have stood by Me in My trials; and just as My Father has granted Me a kingdom, I grant you that you may eat and drink at My table in My kingdom, and you will sit on thrones judging the twelve tribes of Israel.
Scripture says that there is only one father:
Matthew 23:9
"Do not call anyone on earth your father; for One is your Father, He who is in heaven.
But Scripture also says:
**Acts 7:2 **
And he said, "Hear me, brethren and fathers! The God of glory appeared to our father Abraham when he was in Mesopotamia, before he lived in Haran,
Acts 22:1
“Brethren and fathers, hear my defense which I now offer to you.”
1 Cor 4:15
For if you were to have countless tutors in Christ, yet you would not have many fathers, for in Christ Jesus I became your father through the gospel.
Scripture tells us that there is only one teacher, Jesus:
Mt 23:6-8
And the things desired by them are the first places at feasts, and the chief seats in the Synagogues, And words of respect in the market-places, and to be named by men, Teacher. But you may not be named Teacher: for one is your teacher, and you are all brothers.
But Scripture also says:
Acts 13:1
Now there were at Antioch, in the church that was there, prophets and teachers: Barnabas, and Simeon who was called Niger, and Lucius of Cyrene, and Manaen who had been brought up with Herod the tetrarch, and Saul.
1 Cor 12:28
And God has appointed in the church, first apostles, second prophets, third teachers, then miracles, then gifts of healings, helps, administrations, various kinds of tongues.
There are also other mentions of intercession/mediation other than Christ in scripture:
Matthew 18:10
"See to it that you do not despise one of these little ones, because I tell you, their angels in heaven always have access to my Father in heaven.
Rev 5:8
When He had taken the book, the four living creatures and the twenty-four elders fell down before the Lamb, each one holding a harp and golden bowls full of incense, which are the prayers of the saints.
Rev 8:3-4
Another angel came and stood at the altar, holding a golden censer; and much incense was given to him, so that he might add it to the prayers of all the saints on the golden altar which was before the throne. And the smoke of the incense, with the prayers of the saints, went up before God out of the angel’s hand.
When Catholics state that Mary is co-mediator, we are not saying that “co” means equal, but that she also played her part in salvation history.
To say that Mary is not a mediator in any way shape or form because of what 1 Timothy 3:5 says is taking it out of context.
God allows us humans to join him in his plan of salvation, and this is what He is doing with Mary.
(scriptures taken from
biblechristiansociety.com/))