When I googled prayers to Mary for forgiveness, hundreds of sites popped up. Your own RC catechism says Mary redeems believers along with Christ.
Paganism.
Nope, just an artifact of your insufferable ignorance. The Catechism of the Church (963) acknowledges and honors Mary as being truly the Mother of God and of the redeemer. It does not claim that she is either a redeemer of co-redeemer.
If you want to reiterate the beliefs of the Catholic Church intellectual honesty would dictate that you actually check with the Catholic Church, not mine Google sites looking for collaborative or out of context quotes.