The huge problem is that the works of the RC sacraments remove grace entirely from the equation.Wesley, I think most Christians would say they believe salvation is through grace, correct? The Church teaches that these graces are conveyed or imparted to us through the sacraments... Baptism, Communion, Reconciliation, etc all pour out graces needed for salvation.
Salvation becomes this process:
Humans perform a sacrament, which is the cause agent that moves God to save them. Humans commit sins, which causes God to reject them. Humans perform a sacrament, which causes God to save them. Humans commit sins, which causes God to reject them. Humans...
That's the circular world of works salvation apart from God's grace. Grace does not have any functional purpose in such a circular pattern. Moreso, the teaching that the sacraments save is anathema to the gospel at every step.
Thus, the traditions of the RCC and OC must be thrown out whenever salvation by works is introduced in their teachings.