What 'unbelievers' don't realize is, the responsibility for the Christian ends, after they've shared the Gospel. Becoming a member of the "Body of Christ" is a Spiritual process that is accomplished by the Holy Spirit. Once the 'unbeliever' has heard the Gospel and rejected it, that's on them. They are the ones who will someday stand before God and judged by their WORKS and subsequently be cast into the 'Lake of Fire.' for eternity. Satan will be cast into the SAME 'Lake of Fire.' It's a place of unending torment and, you don't want to take a chance on ending up there. God has offered anyone who hears the Gospel and places their faith in Christ alone and not in themselves or anything else, forgiveness of ALL their sins and they'll inherit eternal life with Him, in Heaven. A 'true' Christian goes directly to be with God as soon as they die. The 'unbeliever' goes directly to Hades. (Hell)
Hades (Hell) is a place of torment where the 'unbeliever' will reside until they're brought before God at the final judgment. Like I said above, they'll be judged by their WORKS and subsequently cast into the "Lake of Fire" to suffer throughout eternity. Satan will be there, as well.