What is your position on the Torah and the Koran?
Are they just the results of the cultures they arose from? And not inspired by a God?
What endows the Bible with a supernatural validity that you don't ascribe to the Koran?
Personally for me, the Quran is not inspired directly by God and is instead an attempt of the devil to pass on false religion to a large portion of the earth.
The Torah, on the other hand, is a guildeline for Hebrew living at the time of its conception. Jesus set us free from these laws, some of which were intended only for our protection as they were relevant. Retaining proximity from a menstruating woman and not eating hoofed animals or shellfish, are laws that are not really applicable to our modern living. The ten commandments are still valid to us, as Jesus refers to them countless times. It can be hard as people like to pick and choose which laws to follow, but the Messiah clarifies which laws take priority over the others.
Master, which is the great commandment in the law? Jesus said unto him, Thou shalt love he Lord thy God with all thy heart, and with all thy soul, and with all thy mind. This is the first and great commandment. And the second is like unto it, Thou shalt love thy neighbour as thyself. On these two commandments hang all the law and the prophets.
This is how we should strive to live.