They want the earth to die. It's literally prophesied in their Scriptures, that the sign that their Rapture is imminent include famine, death, war, and conquest. Their explicit goal is to bring about the Second Coming, wherein so many people will be killed, their blood fills up the Armageddon up to the shoulder of a warhorse. The old heaven and old earth, our earth, will very destroyed, so that paradise can come for God's Chosen.