No, but when you add that you can only come to Christ through Mary, that her intervention is necessary for salvation, then you've moved into heresy.
The foundation of all our confidence is found in the Blessed 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.
UBI PRIMUM ON THE IMMACULATE CONCEPTION ENCYCLICAL OF POPE PIUS IX FEBRUARY 2, 1849
http://www.papalencyclicals.net/Pius09/p9ubipr2.htm
Truth mixed with a little false teaching is the heresy.
It only takes one, small Baby Ruth; floating in the punchbowl; to make the entire buffet table unappetizing.