Antinomianism:
Antinomianism (a term coined by Martin Luther, from the Greek ἀντί, "against" + νόμος, "law"), is defined as holding that under the gospel dispensation of grace, moral law is of no use or obligation because faith alone is necessary to salvation[1]
Although the concept is related to the foundational Protestant belief of Sola Fide where justification is through faith alone in Christ, it is taken to an extreme in antinomianism. It is seen by some as the opposite of the notion that obedience to a code of religious law earns salvation: legalism or works righteousness.
[1] Antinomian Controversy in Christianity