What Do Christians Obey?

I love pork chops on the grill. Pork ribs are even better. Of course I consider bacon a delicacy. As a Christian I see no problem with consuming hogs, but as I read the Bible I see that there are commands in the Old Testament that forbid the eating of pork.
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There are other Old Testament commands that I do not follow either. Does this mean that I think it is okay for Christians to just pick and chose which of God's commands that we want to follow? Not at all! Jesus said, “If ye love me, keep my commandments.” (John 14:15)
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To better understand this issue, let us look at the human history of God's interaction with mankind. First, God gave a simple command to Adam and Eve about not eating from a tree. They could not keep that one simple command. As time went on men ignored God so much that He sent a worldwide flood and only Noah and his family were saved. After the flood God told them that they could eat any animal (Genesis 9:3), but that they could not eat the blood from the animals. Further they were not to murder other humans. The commands to Noah were given in the context of a covenant with him and all his descendants. All humans have descended from Noah, so this applies to all of us.
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As we continue reading the history of the Bible, we come to Genesis 17 and a man named Abraham. God makes a covenant with him and his descendants. With that covenant there was a promise of a land. God then gives a special command that only applies to Abraham's descendants- they are to be circumcised as a token of God's promise to them. The Israelites (Hebrews/Jews) were descendants of Abraham, so this command was important to them.
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God ended up setting the Israelites apart from other nations and dealing with them in a very special way. As we read the Old Testament of the Bible we see the History of God's interaction with them. Moses ends up leading them out of slavery in Egypt and as he does so, he gives them the 10 commandments as well as other ordinances including the restriction about eating pork. This was a new restriction- remember that Noah had not been given this command. Further this command only applied to the Israelites.
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The strict rules that the Israelites were given were important because Jesus Christ- the savior of all mankind- would come from that nation and these rules showed that just like Adam and Eve, all of mankind could not perfectly obey God's rules and therefore needed someone who could pay for their sins. Jesus was the first sinless person to walk this earth because He is God in the flesh. Therefore the rules that God gave the Israelites showed them they needed a savior. “Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith. But after that faith is come, we are no longer under a schoolmaster. (Galatians 3:24-25)
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In other words, after we have trusted Christ there is no more need for the Hebrew law. Other passages such as Romans 10:4; Galatians 2:16; Colossians 2:13-17; and Ephesians 2:15 also show that the Hebrew law is no longer in effect for the Christian. This issue actually came up in the early Christian church and we can read how it was dealt with in Acts 15:1-20. At the end of that passage the Christians are told to abstain from things polluted by idols, from sexual immorality, from things strangled, and from blood. This shows that although the Christian is not under the Hebrew law given by Moses, there are still expectations for the Christian. In fact the Old Testament law given to Noah still applies as we see the continued restriction on blood. Further as we read the New Testament is clear that Christians are not to lie, steal, covet, murder, or commit adultery. Further there is condemnation for gossip, drunkenness and extortion. We are not picking and choosing what we obey, we simply obey the commands of God that apply to us today.