"Mary's role in redemption is to be saved just as all sinners are saved by trusting Christ for her salvation. She is dead now and serves no useful purpose to those on earth except for her role historically as the mother of Jesus."
"However, you might want to know that the vast majority of Christians living and dead might not agree with you."
Point out in the scriptures where the statement is wrong. The fact that spiritually the dead in Christ are alive with Him in heaven does not take away from the fact, no where in the scriptures does it say Mary has anything to do with redemption except historically as the mother of Jesus.
"Point out in the scriptures where the statement is wrong."
Point out in the scriptures where the statement is right.
The Church determined which writings were the word of God and which were not.
This same Church founded by Our Lord and Savior, Jesus Christ, has venerated His mother for nearly 2000 years.
You would never even have seen the scriptures had not several monks (who by the way venerated the Mother of God) copied and recopied them for us.
"... except historically as the mother of Jesus." And what is that "historic" role? If we look at the two chapters of Luke, we see that this is far more significant than the role of mother of being the mother of Isaac or Samuel. "And the Word became flesh." as John puts it. Mary is an integral part of the mystery of the incarnation.