When you consider the biblical references to judgment, you run into something that looks an awful lot like a contradiction: Judge not so that you may not be judged (Mat 7:1, Luk 6:37), but shun those brethren that are fornicators, idolaters etc. (1 Co 5:11 was quoted), and don't let false teachers into your house (2 Joh 1:10 was quoted).

Besides these, you find Jesus being rather judgmental about people, calling them swine and dogs that you should not waste your pearls on (Mat 7:6), and Paul promises to those that display the fruits of the flesh that they will not inherit the kingdom of God (Gal 5:19-21).

God of course doesn't contradict Himself, and this is only a contradiction if you put the first quote absolute, because then, you cannot judge anyone anymore to be a false teacher, a whore monger, a swine unworthy of your pearls, or exhibiting any of the fruits of the flesh Paul lists. The point about not judging is that we should follow God's assessment in every way, and not lean unto our own understanding when it comes to judgment (or any other moral and ethical, social and personal issue, for that matter, Pro 3:5-8).

Thus, we can follow God in saying that homosexuality is an abomination to Him (Lev 18:22, Rom 1:26-27), without being judgmental on our own accord. Thus, we can say that liars and cowards are going to burn in the lake of sulfur (Rev 21:8), and don't keep company of people who ignore or ridicule God's Law (2 Ti 3:2-5), without be judgmental, for we are obedient to His will in doing so.

Go to the following articles here:

On the Matter of Marriage

On the Matter of Love

On Obeying the Law of the Land