sin is not a disease

We cannot "cure" sin with the Gospel or with any words we say.

To say that Jesus is the cure for sin is also limited and devaluing the actual thing that Christ did do.

Christ died for sin. Sin requires a rebirth not just a cure. Sin is the entire essence of who we are as 

we come into this world, spiritually dead. Sin required death of Chrsit. And His death gives us new