Why don't christians keep the dietary laws of Moses?

For Muslims who are not familiar with the teachings of Jesus, this is a legitimate question. Moses gave the Israelites food regulations and these are largely consistent with the dietary laws of Islam. This is even in the Bible, so why do Christians not follow these laws?

Mark 7:18-19
He said to them, ďAre you thus without understanding also? Donít you perceive that whatever goes into the man from outside canít defile him, because it doesnít go into his heart, but into his stomach, then into the latrine, thus making all foods clean?Ē

Jesus made it clear that food is not actually what makes people unclean. It is the thought of man, what is in his heart that makes him clean or unclean. Jesus clarified the teachings of Moses. It is because of these words of Jesus that Christians do not observe the dietary laws of Moses.
Moreover, a Muslim should definitely not find this strange. The Quran says that Jesus would allow certain things that were prohibited under Moses:

Surah 3:50
"'(I have come to you), to attest the Law which was before me. And to make lawful to you part of what was (Before) forbidden to you; I have come to you with a Sign from your Lord. So fear Allah, and obey me.

How is it that certain things were allowed by Jesus that were prohibited under Moses? The Quran gives no further explanation, but the Bible gives us the answer:

John 1:17
For the law was given through Moses. Grace and truth came through Jesus Christ.

Jesus brought grace and truth, were Moses braught the Law (Torah). This difference is important and explains why Christians see certain things differently than the Jews. The Jews do not actually have the grace and truth Jesus brought.

Is Everything than permissible for Christians? Certainly not. There are some things which are forbidden for christians, some of these things are listed in Acts. These provisions are consistent with the covenant of Noah. This alliance has seven laws that apply to all people, because all humans descended from Noah.

Acts 15:29
that you abstain from things sacrificed to idols, from blood, from things strangled, and from sexual immorality, from which if you keep yourselves, it will be well with you. Farewell.Ē