Answer: sin

AnswerCrossword Clue
SINReason to confess
SINBad thing to do
SINDo the wrong thing
SINConfessional topic
SIN... of omission
SINCommandment violation
SINDefy a Commandment
SINFall from grace
SINOmission, perhaps?
SINIt may be deadly
SINReason to atone
SIN"The Scarlet Letter" subject
SINSloth, e.g.
SINTrespass
SINBreak a commandment
SINStray, maybe
SINMoral wrong
SINOne of the seven deadlies
SINCoveting, per the Bible
SINSomething wrong
sinoffense against a religious or moral law
SINSomething to atone for
SINKind of tax
SINLust, for one
SINBreak a Commandment
SINDeplorable act
SINMoral transgression
SINOffense
SINTransgression
SINFall afoul of the good book (and the end of a split order of plum sauce)
SINMeans to excommunication
SINDo wrong
SINSermon topic
SINRisk perdition
SINWickedness
SINCardinal of the Philippines
SINSloth or envy
SINClerical error?
SINSermon subject
SINSloth or gluttony