Those involved in witchcraft use the word, “Zombie,” to describe corpses which have been brought to life. They are often depicted as gruesome figures that wander the earth, haunting those who are alive. The Bible doesn’t use the word, “Zombie,” but, it still had a category for dead people who are alive.
The Bible says, “You were dead in your trespasses and sins, in which you formerly walked according to the course of this world” (Ephesians 2:1-2). Here you have dead people (spiritually) walking around (physically). This is how God views unbelievers. Although they are alive and breathing and walking and talking, they are dead in their sins. They are unresponsive to the Spirit of God. They need to be made fully alive.
In contrast, believers in Christ are fully alive. They are alive physically and spiritually. “Even when we were dead in our transgressions, [God] made us alive together with Christ” (Ephesians 2:5). This is all the grace of God! “By grace you have been saved” (Ephesians 2:5).