Cherrypicking the Bible?
On face value, it can seem that Christians pick and choose which parts of the Bible they want to obey, and which parts they want to ignore. The issue has come to the fore because of the current debate over same sex marriage, in which Christians can be accused of hypocrisy in claiming the Bible is God’s inspired Word, but not obeying all of it, including the many ‘obscure’ laws in the Old Testament. We may be told that if we no longer observe food laws, we should also be willing to change on sexuality laws, which are in the same book.
So what is going on? Is it true that Christians choose to conveniently ignore these laws, while only holding to those that serve their own moral agenda? Sadly, that can be true.
However any Christian who does not seek to follow all the laws of the Old Testament needs to have a sound reason for doing so, especially if they are going to not only properly understand the Bible, but also explain their faith to those who question.
A simple answer to question of why Christians are allowed to eat shellfish even though it is prohibited in Leviticus 11:9-12 is the teaching of Jesus:
Again Jesus called the crowd to him and said, “Listen to me, everyone, and understand this. Nothing outside a person can defile them by going into them. Rather, it is what comes out of a person that defiles them.” After he had left the crowd and entered the house, his disciples asked him about this parable. “Are you so dull?” he asked. “Don’t you see that nothing that enters a person from the outside can defile them? For it doesn’t go into their heart but into their stomach, and then out of the body.” (In saying this, Jesus declared all foods clean.)’ He went on: “What comes out of a person is what defiles them. For it is from within, out of a person’s heart, that evil thoughts come—sexual immorality, theft, murder, adultery, greed, malice, deceit, lewdness, envy, slander, arrogance and folly. All these evils come from inside and defile a person. (Mark 7:14-23)
On what basis could Jesus seemingly overturn the Old Testament laws about clean and unclean foods, and turn it instead into an issue of what is going on in a person’t heart? Did he actually overturn them, or is there something else happening?
‘Abrogation’ vs. ‘fulfilment’
Abrogation is the idea that one idea or rule is overturned and replaced by another, newer idea or rule. In religious terms, it means that God says something new that replaces something He said previously, simply because it’s His prerogative as God to change His mind. Or, as some ‘progressives’ would say, our primitive and limited understanding of what God was saying in the past has been replaced by a fuller, more enlightened understanding; so we no longer need to take notice of things in the Bible that are outdated.
Abrogation is not a Biblical idea. The Biblical writers are clear that God does not change His mind like a human being does (Numbers 23:19). Jesus said that he did not come to abolish the law or what the prophets had said (Matthew 5:17). Paul says that the Gospel does not ‘nullify’ the law, but rather ‘upholds’ it (Romans 3:31).
So Jesus was not simply saying, ‘Times have changed, and so a new rule applies.’ Nor was he claiming some kind of divine ‘Son of God’ right to take away from or add to the Bible.
Fulfilment is the idea that earlier rules or ideas are given by God not as end in themselves, but in anticipation of something that is to come later. They point to, foreshadow and prepare people for what is 
to come. (Something like the prompting message, ‘type to enter text’ in a word processing textbox – it creates the space for the intended text to be entered.)
What that means is when the fulfilment comes, along with the new thing, the fulfilment doesn’t abolish the earlier rules and ideas, but actually affirms, honours and completes them. Fulfilment takes the principle behind the rule or idea, and gives it its fullest expression.
The Bible presents Jesus as the fulfilment of the law and the prophets – the rules and messages of the Old Testament. The Old Testament is full of patterns and structures that point to Jesus. Now that Jesus has come, those patterns and structures are ‘obsolete’ in the sense that anyone whose faith is in Jesus does not need to observe them literally, because their full meaning is found in a relationship with Jesus; however Christians do not remove them from the Bible because they stand there as a way to understand who Jesus is and what He did in a fuller, richer way.
All the laws about clean and unclean foods, practices, and even the seemingly obscures laws about clothing, haircuts and washing were all things that made the Israelites distinctly different to all the nations around them. They were also a constant reminder to them that the creation is not the way it is supposed to be – it has been tainted with sin and death and disease. While many of the laws had a practical use in terms of health and hygiene, they primarily existed to highlight the difference between the way the world (including us) is, and the way it was meant to be before human sin spoiled things.
So, these laws pointed to something beyond themselves: the promise of God that one day the world we live in – and we along with it – will be restored to its original creational design.
How to know what to keep
Why does this mean that Christians continue to uphold Leviticus 18:22 but not Leviticus 11:9-12? It’s because the law about eating shellfish was one of those rules that foreshadowed Jesus, whereas the law about homosexuality was based on a moral principle of sexual and marital purity, that Jesus repeatedly affirmed as still standing (along with the rest of the Ten Commandments – for example, see Matthew 5-7 and 19:18).
The Ten Commandments were the moral code upon which the laws of Israel were built. All of the more than 600 laws on the Old Testament can be traced back to its foundation in one or more of the Ten Commandments. Now that structure has been removed by the coming of Jesus, the foundation still remains. So, instructions given to Christians in the New Testament are also built on this same moral code; the key difference being that Christians, through faith in Jesus, have been given a freedom to obey this moral code not from a fear of punishment, but as an expression of a restored relationship with God. So a Christian’s motivation for not practising homosexuality is not primarily because it is forbidden, but because they see that it is a distortion of something with is far better and life-giving. A Christian seeks to obey God’s design with a joyful heart rather than outward conformity.
New Jerusalem 