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

[Blue3]

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?

[Blue3]

If we're talking about it from a Christian perspective, then the concept of "if there is no God" is a nonstarter.

What if the Christian God is real, but would want his followers to believe this? That is the idea I'm asking to be considered. That God is real, but keeps conclusive proof of his existence uncertain because he wants people to be at peace with the idea of there not being a God or afterlife.

[Blue3]

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.

Can't agree with this.  Man is fallen, remember?  That's how all this started. 

Doesn’t Genesis day that God created us, and saw all was good? That’s the core.

[Blue3]

It didn’t change the core. If it did, Jesus couldn’t have been both God and man.

[Blue3]

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.

[Blue3]

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

[Blue3]

Good at core, which sin does not change.

Or else Jesus can't be fully human and fully God, as most Christians accept as fundamental.