Opinion of theists who believe this regarding God/death/afterlife?

[True Federalist (진정한 연방 주의자)]

We should train ourselves to be at peace with life, death, and the universe -- even if there is no God and/or no afterlife. We should have no fear of death. To believe in God and Heaven, but to also accept there's at least a small possibility that they might not exist, yet still be at peace. Believing that every person, at their core, is good; believing that life itself, at its core, is good; believing that he universe itself, at its core, is good; believing that these truths don't change even if there is no God or Heaven. Being at peace whether the previous beliefs about God, Jesus, and the Afterlife are right or wrong. Same for being at peace if another form of afterlife is true, like: reincarnation, or a neutral/varied afterlife in this universe or a spiritual dimension, or losing personal identity to become one with something. Being at peace with the actual process of dying, being at peace with the potential end of you and your relationships, being at peace with your life's work potentially going unfulfilled, being at peace with potentially never knowing the future of your loved ones or society or the universe, being at peace with death inevitably being forced upon you and everyone else and not knowing when or how.

Opinions?

The bolded part is what loses my support.  While I see Eden as myth rather than history, it does encapsulate what I think is an essential truth.  Humanity lost its innocence when it learned that what is good for one can be evil to others. (Not must be, just can be.) It wasn't the tree of good and evil whose fruit Adam and Eve partook of, but the tree of the knowledge of good and evil.

[True Federalist (진정한 연방 주의자)]

We should train ourselves to be at peace with life, death, and the universe -- even if there is no God and/or no afterlife. We should have no fear of death. To believe in God and Heaven, but to also accept there's at least a small possibility that they might not exist, yet still be at peace. Believing that every person, at their core, is good; believing that life itself, at its core, is good; believing that he universe itself, at its core, is good; believing that these truths don't change even if there is no God or Heaven. Being at peace whether the previous beliefs about God, Jesus, and the Afterlife are right or wrong. Same for being at peace if another form of afterlife is true, like: reincarnation, or a neutral/varied afterlife in this universe or a spiritual dimension, or losing personal identity to become one with something. Being at peace with the actual process of dying, being at peace with the potential end of you and your relationships, being at peace with your life's work potentially going unfulfilled, being at peace with potentially never knowing the future of your loved ones or society or the universe, being at peace with death inevitably being forced upon you and everyone else and not knowing when or how.

Opinions?

The bolded part is what loses my support.  While I see Eden as myth rather than history, it does encapsulate what I think is an essential truth.  Humanity lost its innocence when it learned that what is good for one can be evil to others. (Not must be, just can be.) It wasn't the tree of good and evil whose fruit Adam and Eve partook of, but the tree of the knowledge of good and evil.

But the essential truth of the Eden myth IS the message that we are all good at our core.

Really? It's clear from the narrative that once Adam and Eve ate the fruit, they got all scared. Why would they be scared if they knew they were good?

[True Federalist (진정한 연방 주의자)]

Their act didn’t change that God created us in his image, and declared us good.

Good when created, not eternally good.