From the Westminster Shorter Catechism :
Q. 14. What is sin? A. Sin is any want of conformity unto, or transgression of, the law of God.
From the Baltimore Catechism :
Q. 278. What is actual sin? A. Actual sin is any willful thought, word, deed, or omission contrary to the law of God.
From Senator Obama :
Q. Do you believe in sin? OBAMA: Yes. Q. What is sin? OBAMA: Being out of alignment with my values.
Not that there is anything to the chatter about Senator Obama’s “Messiah complex,” mind you.