Properly distinguishing the Law from the Gospel is one of the most important tasks in Christianity. Unless the Law is properly distinguished from the Gospel, unless the Law is properly separated from the Gospel, then it will be impossible to teach Justification By Faith Alone correctly. All false gospels reject Justificaton By Faith Alone. Most false religions, like Islam, do not have the Gospel. Some false religions, such as Roman Catholicism, mix Law and Gospel together--destroying Justification By Faith Alone. So again, the ability to properly distinguish the Law from the Gospel is absolutely critical in Biblical Christianity.