The way I have it set up is the sins are different types of demons. Kind of like separating out the elements, only into categories of corruption. It works well for my world set-up.
Seen a lot of TV references (just skimming through), but one of the most interesting book "abilities" is in Brand Sanderson's Mistborn. I forget all the names, but some people can "burn" metals in their stomach, giving them the ability to do different things. Each metal does something different. There's a metal you can push yourself against, a metal to pull, one that lets you sense others burning metals, and one that hides people burning. Usually a person can only burn one metal, but there are some that can burn all of them (those are the Mistborn.)
Really interesting concept, and he writes it really well. It's pretty hardcore fantasy, but still a great read.