"And, in a small way, you are mocking us because it isn't your God if you understand what I'm saying"
Make your God appear to me in physical form that can be seen, heard & touched (and no, not Jesus), so he can speak for himself. Until you can, therefore God doesn't exist. Prove otherwise. Thus blasphemy is a victimless crime. And if you aren't being insulted personally (even if you are, grow a thicker skin already!), why should you care what others say?
"a God you do not even believe in and using that possession for, what we consider, a sinful purpose"
'Sin' is defined as disobeying divine law, or going against rules laid down by a deity. But since we Atheists refuse to acknowledge the existence of a 'God(s)', until proof of such can be provided to our satisfaction (see above), then we're not sinners! And you're not God, therefore you can't consider for someone who can't speak for himself. And why is that?
Because he doesn't exist.