Jehovah's Witnesses believe that at armageddon God will destroy the wicked. Of course they will be spared but the rest of us will not be so lucky. All false religions will be destroyed allong with everyone who belongs to Satan's organization.
Since 1925, the Watchtower has been telling us we only have two choices. God's channel of communication (their religion) and Satan's organization (everyone else). Watchtower Jan 15, 2001, Article: 'Keep in Step With Jehovah's Organization', par 9,10; Watchtower June 15, 1987, Article: Testing and Sifting in Modern Times, par 13,14; Only JW's have an scriptural hope of surviving armageddon. Watchtower Sept 1989
However if God were to destroy all people at armageddon because they didn't correctly guess which religion is the best one, he would be more evil than the majority of people he destroys.
Instead of forcing people to belong to one religion, imagine a paradise earth in which you are free to do and say anything you want as long as you do not infringe on the rights of others or harm them in any way. Your motto is 'Do no harm'. No restrictions are placed on your lifestyle, conduct, appearance, or beliefs. You are free and all your neighbors are free. The world isn't turned into chaos. Opposing viewpoints are celebrated and encouraged. The glue that holds the world together is love.