Antinomianism is more common than one might think. Kevin DeYoung helpfully points out seven statements that have, historically, been characteristic of antinomianism.
Antinomianism: It's Bigger than You Think | DeYoung, Restless, and Reformed
The scary thing is how common some of these statements are. In fact, I'll admit to having said something like one of these myself a time or two (I know better now, of course).