What part of the theology are you doubting?
Do you doubt that the Holy Spirit works through the Son, Jesus Christ? Because there never was a time when the Son did not exist, or the Holy Spirit, or the Father. God is eternal and predates the universe, much less Bethlehem and Nazareth. So yes, the Holy Spirit always worked through the Son. (And I’m sure the inner workings of the Trinity are full of the reciprocity of love, because God is Love, but Trinitarian theology is a whole other big subject I won’t tackle.) That’s not a problem.
Do you doubt that all graces come to humanity through the Son, Jesus Christ?
Do you doubt that the Son, Jesus Christ, was incarnate through the Virgin Mary?
This isn’t a matter of idolatry. It’s a matter of humbly recognizing that, mysteriously and kindly, God the Trinity chose to send the Son to us through the consent and the human body of Mary, a Jewish woman of faith. God, mysteriously and kindly, loves to dispense His graces to us through the instrumentality of normal human beings, including Mary, and sometimes including you and me. He loved it so much that He made Israel His covenant family, and then became Himself a son of Israel. Do you doubt this?
All God’s graces come to us through Christ, He Who came to us through Mary, He Who came to us through David, and Ruth, and Rahab and Tamar, and Abraham and Elizabeth, and Noah, and Adam and Eve. Do you doubt this?
Anyway, Pope Leo XIII quotes St. Bernardine of Siena as saying, “Every grace that is communicated to this world has a threefold course. For by excellent order, it is dispensed from God to Christ, from Christ to the Virgin, from the Virgin to us.” And St. Bernardine of Siena was all Christ all the time, believe me. His whole mission in life was promoting the Holy Name of Jesus. He would never have exalted Mary at the expense of Jesus’ glory.
I think the problem here may be that you think the person who gives out the king’s alms is as great as the king. That’s not the way it works. The king’s queen-mother and maidservant has only the glory that the king gives her and wants her to have, and if that glory is great it speaks of the king’s generosity, and how glorious beyond all bounds that the king must be. How can we treat the king’s mother less worthily than the king does?
And she would be the first one to tell you that she does not own the alms, but only gives them away.