I think the idea is heretical, but apparently popes throughout history didn’t. Check out these quotes:
**The foundation of all our confidence is found in the Virgin Mary. God has committed to her the treasury of all good things, in order that everyone may know that through her are obtained every hope, every grace, and all salvation. For this is His will: that we obtain everything through Mary. Sweet heart of Mary, be my salvation! **Pope Pius IX
**For, since it is the will of Divine Providence that we should have the God-Man through Mary, there is no other way for us to receive Christ except from her hands. **Pope Pius X
**He will not taste death forever who, in his dying moments, has recourse to the Blessed Virgin Mary. What will it cost you to save us? Has not Jesus placed in your hands all the treasures of His grace and mercy? You sit crowned as Queen at the right hand of your Son: your dominion reaches as far as the heavens, and to you are subject the earth and all creatures dwelling thereon. Your dominion reaches even down into the abyss of Hell, and you alone O Mary, save us from the hands of Satan. **Pope Pius XI
**Nothing comes to us except through the mediation of Mary, for such is the will of God. O Virgin Most Holy, no one abounds in the knowledge of God except through thee; no one O Mother of God, attains salvation except through thee! Every one of the multitudes, therefore, whom the evil of calamitous circumstances has stolen away from Catholic unity, must be born again to Christ by that same Mother whom God has endowed with a never-failing fertility to bring forth a holy people. **Pope Leo XIII
**Mary, not one of thy devout servants has ever perished; may I, too, be saved! **Pope Benedict XV
I know that Mary points us to Jesus, but that’s NOT what these popes are saying.