This hadith is bogus, it contradicts head on with Quran. I don't want to write all over again I wrote it before where qurans proves there is no such thing as kill the person who leaves Islam. This hadith can go to garbage can.
Look at this verse:
5:33: The punishment of those who wage war against Allah and His Messenger, and strive with might and main for mischief through the land is: execution, or crucifixion, or the cutting off of hands and feet from opposite sides, or exile from the land: that is their disgrace in this world, and a heavy punishment is theirs in the Hereafter;
You may have your interpretation of what "waging war against Allah" or "spreading mischief in the land" means, but I know that in the eyes of many Muslims what we are doing here with the forum, the wiki and the YouTube channels is to attack Islam, and thereby create fitnah in Muslim families or societies. An Islamic state would be justified by this verse to punish apostates who speak out against Islam and try to persuade Muslims away from their faith. Of course, you would object to that, but as far as I can see many Muslims (even so-called moderate ones) would support something like that.
What do you think of freedom of speech? Would you like seeing this forum shut down? In your ideal Islamic state, would we be free to criticize, debate and even mock Islam publicly?