You haven't left anything real. It isn't Jehovah's Organisation, it's just a bunch of deluded fools pretending they represent a god a previous fool named Jehovah.
Why make it official that you don't belong to something that doesn't exist? I reckon it just feeds their delusion that they are important.
Plus ... if you ever want to have an intelligent discussion with a JW, you have to do it while their defences are down, which is why the WT wants you to have DA tattooed on your forehead to ID you as an evil Apostate. Play by their rules ... and they win.