What would you think if a husband heard his wife's vows on their wedding day and thought, "Wow! She promised to love me no matter what? That's great! That means I can be a complete jerk to her and she has to love me anyway!"
Not great.
So why do we take that attitude toward God? Why do we use his love as a license for sin? And, maybe more importantly, how can we die to sin but live to God in Christ?