This present age is not the only day of salvation. Going to heaven or hell when you die is not the gospel of the kingdom of God. That is not good news. That is bad news. The kingdom of God grows in three stages. One of those stages is the time when all who are in their graves will be resurrected and have the opportunity to inherit the kingdom of God. Read Growing the Kingdom of God – the Mystery of Three Seasons, Three Harvests for more details.