Most of them don't have the slightest shred of a clue what authentic Catholic teaching is. Unfortunately, I can't hold them entirely responsible for that; the Church itself is highly blameworthy.
And no, Mary is not my redeemer, and the Catholic Church teaches no such thing. She did, however, coöperate in a unique way with the objective redemption, as the Bible clearly teaches.
co does not stand for “cooperate”
CO
co–
pref.
Together; joint; jointly; mutually: coeducation.
Partner or associate in an activity: coauthor; cofounder.
Subordinate or assistant: copilot.
To the same extent or degree: coextensive.