The reason really for not removing the law is not so hard to understand for me anyway.
If one were to start from scratch and create a new law system then the blasphemy law would not be included. Now that we have had this law for so many years then going thru the system to remove it would send a much stronger signal than to just let it sleep and never get used. Passing and removing laws here is, and should be a long and intricate trip thu the system and it cant go un-noticed by the public. If the government did decide to remove it then they would also inform the population and telling everyone "hey, blasphemy is now legal"......bad idea.
This was never a problem until the right-wing christian paper decided to make a mess. No singe muslim, or group here has _ever_ insulted christians in the media. They do many odd things, but they do not talk crap and respects other peoples belives.