Yes in which you are "acting through an intervening agency". It is only Jesus however that can cancel out our sins. So you have to be specific on what you mean by mediate. I can mediate for you by making request before God.
As I've shown. same thing save it is our sins he deals with you are making intersession which is mediation.
Here is what the Bible says:
1 Timothy 2:5 For there is one God, and
one mediator between God and men, the man Christ Jesus;
1 John 2:1 My little children, these things write I unto you, that ye sin not. And if any man sin,
we have an advocate with the Father, Jesus Christ the righteous:
Hebrews 4:14 Seeing then that
we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast our profession.
Hebrews 4:16 Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.
In the OT the Levitical priests interceded
on behalf of or performed a mediatorial service on behalf of the Israelite. When an Israelite sinned, he/she brought their sacrifice to the priest, and he was the one who had to sacrifice it for them. They could not sacrifice if for themselves; a priest had to do it for them.
The RCC has patterned their system after this OT Levitical system, which has been done away with. The author of the Book of Hebrews spends much time in showing how the Levitical priesthood is of no more effect.
Hebrews 10:4 For it is not possible that the blood of bulls and of goats should take away sins.
Hebrews 10:10-12 By the which will we are sanctified through the offering of the body of Jesus Christ once for all.
11 And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins:
12 But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;
There are no more sacrifices for sins. Christ, in one sacrifice, paid for them all. (Thus OSAS)
He alone is our mediator. He alone is the one that we must go through. He said:
John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
He is the
only way!
Even after salvation he remains the only way of approach to God.
He is the only mediator that the believer has. There is none other.
A mediator is like a lawyer, an advocate. He represents you. Christ represents me as I go to the Father in prayer. I cannot stand before a Holy God, a Holy Father. I can only do so because I am covered with the blood of Christ; his righteousness. I cannot stand before God and mediate for your sins. Only Christ can do that, and only if you are saved.
Only Christ can be your mediator.
I can pray for you, for your needs, for the needs of your relatives, etc.
But I cannot mediate for you. There is one mediator and that is Christ. There is only one person that can stand between you and God, and that is not me, and certainly not Mary--it is Christ alone.
1 Timothy 2:5 For there is one God, and
one mediator between God and men, the man Christ Jesus;