Then Peter, filled with the Holy Spirit, said to them: ‘Rulers and elders of the people! If we are being called to account today for an act of kindness shown to a cripple and are asked how he was healed, then know this, you and all the people of Israel: It is by the name of Jesus Christ of Nazareth, whom you crucified but whom God raised from the dead, that this man stands before you healed. He is ‘ the stone you builders rejected, which has become the capstone.’ Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved.’ Acts 4:8-12
Apostle Peter (Whom the Roman Catholic attributed their traditional authority under the order of Peter), in the scripture attributed that ONLY in the Name of Jesus, can salvation be found, and NO OTHER NAME! So why is Mary the co-redemptrix of Salvation? If this is not the doctrine of demons, then i do not know what gospel is this?
My footsteps in the River of time 
The link below should clear up your misconception on the matter, as long as you first pray to the Holy Spirit for guidance.
http://www.voxpopuli.org/response_to_7_common_objections_part1.php
the link to another catholic apologist is at best deflecting accusations of paganistic worship in the terms and definition of co-redemptrix.
Mary tho obedient to God in her role as a mother that brought Jesus to this world, HAS NO OTHER ROLE, in fact has no way shape or form as a participating agent for Man’s salvation.
One objection, if we were to use the Catholic apologist way of explanation, then Devil would be co-redemptrix, or King Herod, or why not Joseph? and why aren’t the pagan catholics worshipping Simeon since the line of argument this apologist deploy equate Simeon as co-redemptive role like Mary?
Two, co-redemptrix is not the term i would use, like Queen of heaven, if its implications are plain. Queen of heaven is not the same as Queen of England, nor Servant handmaiden of God as Co-redemptrix that anyway involved in the redemption of Man’s Sin. Jesus ALONE is our salvation, no one else.
Thanks for giving me the chance to explain and to shed some light to the Catholic demonic doctrines of Marian Worship. While i respect Mary as a servant of God and her role in her obedience as the channel for the birth of Jesus, i do not worship her. While she has many things i can learn like her humility, her obedience, I do not bow down, nor pray to her, nor equate her to Jesus. I do not need a mary statue in my house to pay this person my respect, so the line of RESPECT and WORSHIP needs to be defined and drawn.
Please note, i think we had enough of this discussion, and i will continue to shed light to the paganistic and demonic doctrines of the Roman Catholic, until i am proven beyond the shadow of doubt from the Scriptures, that i ought to pray to Mary or acknowledge the Pope as the head of the church, i will not approve any comments on any articles that speaks against the false teachings of the demonic-inspired Roman Catholic Church.