Has to do with personal responsibility. If GOD made you as such that you could only do certain things and NOT sin <there's that word again> then it's really not faith, and god made you like a puppet. FREE WILL is what underlies responsibility, not some deterministic element of GOD-control (for lack of a better thought) that makes you do certain things. If you are not a self-determined being then all things are permissable because technically nothing is your fault. Whatever. Thought I'd write this cause I'm bored. Love you.