If this commandment is "outdated" what about Leviticus 18:21: Do not make any of your children walk through the fire of Molech [a form of human sacrifice] and do not profance the Name of G-d, I am the Lord.
Or how about Leviticus 18:23: Do not lie with an animal to be contaminated by it; nor shall any woman be mounted by an animal--it is a perversion.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." -Manuel II Paleologus