Religious sins are supposedly unchanging, universal rules dictated by gods. Yet these inflexible rules have flexed over time. (For example, not raising a child Catholic was once considered sinful.) The concept of sin must therefore be based on human advancement and adaptation, rather than godly pronouncement.
The seven deadly sins are said to be:
Lust – Scratch this off the list. Humans are animals, animals have a natural desire for sex. Thought-sex is healthy.
Gluttony – It is okay to indulge every once in a while, but try not to be wasteful.
Greed – Wealthy Catholics, anyone?
Sloth – Some people sleep in because they are up late.
Wrath – Even Mister Rogers said that it's okay to be angry.
Envy – Rarely accomplishes anything positive; breathe deep, move on.
Pride – Boasting is somewhat arrogant, but if you think you created something worthwhile, there's no harm in smiling.