Even if the JW's are right and 98% of the planet's population are massacred at Armageddon, who the f*ck would want to worship a God like that? I sure as hell wouldn't.
Satan would be the one laughing, he would be the one vindicated. He would have proved that God had to kill nearly all of the human race at Armageddon. A global genocide against his own imperfect human creation. What sort of vindication is that? Satan would've proved that Jehovah and Jesus are planetary genocidal maniacs. Didn't Jesus say he came to save the world not destroy it? God may as well just have wiped out Adam and Eve at the beginning and started again, cuz after 6,000 years he proved squat since he had to wipe them all out anyway.
I may as well worship Pol Pot, Stalin or Hitler.