Who are you to pass judgment ...
As for the one who is weak in faith, welcome him, but not to quarrel over opinions. One person believes he may eat anything, while the weak person eats only vegetables. Let not the one who eats despise the one who abstains, and let not the one who abstains pass judgment on the one who eats, for God has welcomed him. Who are you to pass judgment on the servant of another? It is before his own master that he stands or falls. And he will be upheld, for the Lord is able to make him stand. -Romans 14:1-4 ESV
Do you find it strange that, in light of these verses, people still argue over food. I know of one religious denomination that advocates the vegetarian lifestyle. The context for these verses was the way that some Jews were hanging on to the idea that foods like pork were to be abstained from. Apparently, the Law of Moses was still a strong force in the church at Rome. It is interesting how Paul tells people to not pass judgment after he judges some as weak.
I think that it is so easy to judge by outward appearances. One thing that life has taught me is that things are not always how they appear. Sometimes the ones who are the strongest on the outside are weak. Many times, people who preach the loudest about sin struggle with the things that they rail against. People will stand or fall before God. God is able to make the weakest stand. Our mission should be one that doesn't judge but helps people to stand.
Help us Lord to be humble encouragers and not pride-filled judges.