That's a frequently misunderstood scripture. Scripture commmands us to "Rebuke our neighbor frankly, so that we do not share in his sin." It tells us to warn the wicked. It tells us to discern spirits.
The kind of judging that we aren't supposed to do. Is the kind that Jonah did. (You should read it, it's short, only 4 chapters). Jonah knew that the city of Ninevah was wicked. Everyone did, including God and Jonah. That's not judging them in the context of the above scripture. That's just recognizing evil.
Jonah was unwilling to go preach to them. He was supposed to go warn them and offer them God's mercy if they repented. Jonah didn't want them to repent. He wanted them to get what was coming to them.
So what follwed is Jonah ran away, ended up in the belly of a fish for three days and got burped out back on land. Which convinced him that maybe he should go preach to Ninevah. Ninevah did repent and Jonah became angry because he had judged them unworthy of God's grace. And in chapter 4 God takes Jonah to task for judging them.
It's not ridiculing evil or the false beliefs that is judging. Prophets of God did that in scripture. It's failure to see their potential and failure to love them despite their actions. That's judging.
"So when they continued asking him, he lifted up himself, and said unto them, He that is without sin among you, let him first cast a stone at her."
No one is suggesting we kill the Mormons. We're simply pointing out their errors in hopes they will see the Light.
I think Jesus would cast his vote for Romney over the zer0.
WHAT?!?
Forget it then. Why take all the fun out of it?
J/K ;-)