>> “For there is one God, and there is one mediator between God and men, the man Christ Jesus...” <<
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It seems that most simply do not wish to accept that responsibility, so they gladly invent mediators out of thin air.
Jesus mediates in a way that no other man can because he is God-incarnate. In that sense, there can be only one mediator, who is our redeemer. But we grow up with mediators between God and us: our parents, our relatives and friends, and the members of our Church. I do not think we are angels-incarnate, who only have to open our ears to hear the voice of God. Adam fell and because of that we are blind, deaf and and numb, and even dumb because our language is never good enough to communicate Perfectly with our fellow human beings. We enjoy the grace of God, or ought to, but we use our spiritual gifts as clumsily as we do our physical ones. Friend we need all the help we can get, to train us up in the faith so they we can learn to walk without stumbling. In short, we need mediators and God also provides them: the angels, and the saints, living and dead, who care for us even when we do not care for ourselves.