The reason why the message on grace can come across as being a license to sin is that such teachers emphasize only the substitutionary truths about Christ’s work. These are spiritual birth truths. They fail to teach Identification truths that deal with spiritual growth.
Emphasizing only truths about justification by the blood leaves one with the mindset that says everything is covered by the blood and so we can continue in sin because grace will cover it. Paul addressed that mindset by showing Christ’s work was not just the shedding of blood.
The second element of his work was the offering of his body for sin. ‘Sin’ here was used in the singular tense to refer to the nature; The blood dealt with sins (plural) while his body was offered up for sin. In the offering up of his body we died unto sin. His blood procured forgiveness for our sins but through his body we died unto sin. The old man was crucified while the new man is dead unto sin and the flesh and its lusts were crucified.
There are truths on our justification but there are truths about our identification with him.