You think death is real, but you quickly forget that everything that ever 'died' is just part of a big DREAM you're having while you're asleep. This world is part of this dream and everything that happens in it is part of a dream.
All wars, all bodies, all old age, all sickness and disease, it's all just part of a giant dream. It's all happening inside a big bubble of unreality where nothing real happens at all.
There is a dream of death, there is imagined death, but there isn't any real death beyond it. Nothing permanent happens here. Nothing has any real effect on anything real. How can a dream affect reality? When bodies in this world 'die', that's still just a fictional event happening inside a giant dream. An imagined death is no death at all. That is why 'death' is reversible within the dream, because it's totally made-up and unreal, and resurrecting inside the dream is also unreal.
Outside of the dream, none of this happens. Outside the dream, you're still completely safe with God, just dreaming of exile and pretending that death is real. The you that is having the dream is completely unaffected by anything that happens inside the dream. You think you are affected as a 'figure' in the dream, while you're dreaming it, but this is just a nightmare that isn't real. The you that is outside the dream is immortal and is not inside the dream at all.
You are just asleep. As the course has said "...sleep is not death. What He created can sleep, but it CANNOT die." You as immortal spirit can have some sleep and dream about being in a world where people die and bodies suffer, but the entire thing is just a fantasy dream. It isn't real at all. It isn't really happening. And it has absolutely NO EFFECT on God or who you really are, outside the dream. All of the fallout and 'effects' of conflict in the dream, STAY in the dream. None of it touches or affects God or your Real Self whatsoever. God is absolutely unchanged by you being asleep and having a dream of something that isn't happening.
This is why you are immortal. What does it matter how many times fictional bodies die or live or suffer or have health or whatever. None of it is who you are really, none of it has any effect on your REALITY whatsoever, and none of it carries over when you fully awaken from sleeping. Where do dreams go when you awaken? They are recognized as having been just an unreal dream, they no longer exist, and nothing has happened. They didn't 'leak out' into reality and they don't have any side effects. They simply disappear.
You can play around with stuff inside the dream and you can become confused about what is appearing to happen, and you can think it is reality since you're out of touch with reality. You can think that serious stuff happens and that real people really die in horrible ways. You can think that making the body not die is important, and you can think that performing miracles is important. You can value healing over suffering. And you can value death over life. None of it is important at all, it's all an illusion. Everything inside the dream is not reality and anything happening in a DREAM has absolutely no real effects!
This is because the dream itself is just an effect. The dream is not a cause. You are the dreamer, dreaming it, and you are the only cause of it. The dream wouldn't exist at all if it weren't for you dreaming. It ALL comes from you. Every last bit of it. And that means there is NO part of it that comes from anywhere else, and there is NO part of it that has any power to 'cause' other dream-stuff to happen. If you didn't write it into the 'script' of the dream, it cannot happen in the dream! EVERY part of it is your dream and is the EFFECT of you dreaming. As an effect, everything that goes on in the dream is NOT a cause, and HAS NO EFFECT, and therefore CANNOT AFFECT YOUR REAL SELF.
One day you're going to stop dreaming and wake up to reality. And you're simply going to become aware of what REALLY exists, which is you as immortal spirit, being with an immortal God of love, forever. And you will know immediately, that there never has been any death, no wars, no sickness, no struggles or suffering, no problems, nothing. It was all just a really horrendous nightmare dream. And THANK GOD it was just a dream! All that's left is you hanging out with God in eternity, with eternal life, completely unchanged from the condition He created you in, absolutely safe from dreams of death, absolutely unaffected and unchanged. You will know - nothing that seemed to happen in the dream has happened at all. There are no real ghosts, there is no real war, there is no real suffering or sickness, there is no death, and there is no world! The whole world, wasn't real.
All that is left is God's Creation, which is all that really exists. What God Created lives and exists, and what He did not create does not exist.
Nothing real can be threatened. (Reality is unaffected by your dream)
Nothing unreal exists. (Dreams are DREAMS, they don't EXIST!)
Herein lies the peace of God. (God KNOWS there is only immortal reality, and that you are a part of it forever)
You're dreaming. You're dreaming of being inside a dream as a little body-identified self that is also a dream. This isn't reality. Nothing that happens here has any real consequences. It is all perfectly contained and not even really happening. The Kingdom of Heaven is perfectly protected from all illusions, and nothing can prevail against it.
You are safe with God and you always will be. This is why there is no need to be afraid - because there literally is nothing REAL to be afraid of. Everything you are afraid of DOES NOT EXIST and is just a dream/illusion. You need not be afraid because there is ONLY LOVE, and God has ensured your absolute safety in reality forever.