I used to think that murder was the worst possible sin.
The Bible is full of murders.
The things that seems to tick off The God of the Bible the most are the worship of false gods and false prophecy (the misuse of his name).
Jesus was crucified for the charge of blasphemy. So it is clearly central to the New Testament.
The claim that the first Commandments are central to the Bible makes sense. The first Commandments establish God's authority.
Murder is usually number 5 or 6 (depending on the enumeration).
!WINE