Salvation is not through Mary. 1. They cannot be saved denying the Son of Mary. 2. Let’s not forget the fact that allah is not the same god as the true God of the Bible, not a small point. What they think of Mary means nothing towards their salvation.
There’s nothing Mary could possibly do to override these two massive issues.
No one said Salvation is through Mary or depends on what they think of Mary.
She merely helps lead to her Son, like a Sunday School teacher leads the kids to Jesus. What’s the problem?