Don't do it.
Your Bible may tell you that, but my Bible tells me to be careful how you judge as you will be judged that way. We make judgements all the time. Parents make judgements concerning their children's friends. We make judgements of people whom we hang out with. Jesus never said do not judge anyone. God wants us to be careful how we judge people - the simple saying don't judge a book by it's cover. Jesus wants us to make good judgements - i.e., judge a tree by the fruit it produces. A good tree cannot produce bad fruit and vice versa. Read your Bible again or go talk to a preist.