Do people keep becoming Christians in the millennial reign?
Yes, people will keep becoming Christians in the millennial reign. Unsaved people who resist the Antichrist and survive the events of the Great Tribulation will still need to be converted and discipled in the ways of Jesus. This will be true for those born during the Millennium as well. Jerusalem will be the spiritual center of the millennial earth where both saved and unsaved people will go to learn the ways of Jesus (Isa. 2:3).