Since so many of the sins mentioned in this thread are of a sexual nature, I'll throw this out.
Are sexual sins more serious than non-sexual ones?

Check out this passage:
1Cor 6:18 Flee from sexual immorality. Every other sin a person commits is outside the body, BUT the sexually immoral person sins against his own body.
19 Or do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own,
20 for you were bought with a price. So glorify God in your body.

It seems to say that sexual sin is more serious because it's against the Holy Spirit. Remember that the only unforgivable in is one against the Spirit. You don't mess with the Holy Spirit. That word 'but' is big. It changes the message of this passage from a sin against the Lord to one against the Spirit.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.