“Roman Catholics believe the truth of the Gospel is heresy”
Not true.
“They look to Mary for salvation”
Not true
“They insist their own good words (did you by any chance actually mean ‘works’?)are required for justification since Christ’s work on their behalf is not enough”.
Not true.
Then why the Rosary? Why the prayers directed to Mary, if she is not an intecessor for you with the Lord? Where in Scripture are you directed to pray to anyone but the Lord himself? Why the need for a third party intervention?