We Catholics have used art in various ways to help express our faith, but this is a stretch in the least! While Our Blessed Mother did share in her Son’s sufferings, she isn’t the direct source of salvation.
On another note, kudos for having a knowledge and guts to question whether or not a heresy has taken place. Not enough Catholics even know what a heresy is…nor do they have the courage to propose the existence of one even if they are knowledgeable. God bless you.
Clement of Alexandria
“’Eat my flesh,’ [Jesus] says, ‘and drink my blood.’ The Lord supplies us with these intimate nutrients, he delivers over his flesh and pours out his blood, and nothing is lacking for the growth of his children” (The Instructor of Children 1:6:43:3 [A.D. 191]).