Romans 14

http://www.esvbible.org/Romans+14/

It is important to welcome people who have weak faith, maybe especially so. Be careful, however, not to argue with them over simple differences in opinion. So often, especially in the US, we get caught up in denomination, and what the differences in our denominations mean. We can never stray to a church outside of our denomination and we are cold and hostile to those who were not raised in our denomination. This way of treating other people is wrong because it does not come from love. If we all love God and believe in the sacrifice of Christ, then we should all love each other even if we disagree. Some Christians may believe in ceremonies such as not eating meat or making one day holier than the others. As far as not eating meat, Paul writes that God revealed to Him there is nothing evil about any type of food. The person who eats all types of food does it in praise because He blesses the food before God then eats it. There is nothing wrong with not eating certain types of food because the person still blesses the food before eating it. The person who does not eat certain foods, however, has the weaker faith because he is putting stock in something other than pure faith in Jesus Christ. It is still up to those with stronger faith not to cause others to stumble, so if it will make someone stumble to see you eat meat, do not eat meat in their presence. Never intentionally cause someone to stumble because that is a terrible thing to do against someone you are supposed to love. Also, never let anyone tell you something you believe to be good is evil. If you believe something, go for it as long is it does not go against anything God or the Bible says. The person who follows what they believe is better than the one who believes something that doesn't act on it because that second person does not act on faith.  Anything not done in faith is done in sin. It is right to avoid eating or drinking anything that causes other Christians to have doubts regardless of the fact that it is not wrong to eat or drink any certain types of food or drink. The Kingdom of Heaven is not made up of what we eat and drink. It's made up of God's approval, peace, and the joy that comes from the Holy Spirit. That sort of joy you feel when you know you've done something that pleases God. That feeling of knowing you are so deeply in love with God and He reciprocates those feelings times a billion. Every person has to make their own decisions regarding faith. We don't live or die to honor ourselves. We live and die to honor God because we belong to Him. Christ died and came back to life to be Lord of the living and the dead. You can never escape Him in all of eternity. You are called upon to honor Him with your life and death. Therefore, we all belong to the Lord as His servants, and it's not up to us to criticize someone else's servant. The Lord will discipline and teach them what is right in these nearly meaningless choices.