True joy is the earnest which we have of heaven, it is the treasure of the soul, and therefore should be laid in a safe place, and nothing in this world is safe to place it in.
Let me be clear that I'm not God so I can't tell you who is and isn't going to heaven. What I know about my relationship with Christ is that as a believer, I am eternally secure. I gave my heart to Christ and that gift of salvation is irrevocable.
God could create the world in six days because he didn't have to make it compatible with the previous version.
Go to Heaven for the climate, Hell for the company