I have little use for religion. But I have much use for "God" ... for the great and divine existential mystery at the heart of everything.
You gave the mysteries a name. How is that useful to you? How is it better than simply acknowledging that there are unanswered mysteries? I suspect that if you find a god belief useful, it is for some other reason.
Their theism gives them a focal point for their gratitude, and for their desire to be more honest, and courageous, and forgiving, and kind. It's an ongoing and unremitting reminder of this quest.
They could do that better as secular humanists. The attitudes would then be endogenous. Who needs to be reminded to be grateful? Is that gratitude if it's not experienced spontaneously, if it needs a method to come back into consciousness?
Who is courageous because they think a deity exists? Where I live in Mexico, we see plenty of unsophisticated people who have the "courage" to face Covid unvaccinated because they believe that a god will protect them. But they lack the courage to take the vaccine. Because I don't hold such beliefs, it's the other way around for me.
Similarly with kindness. If it isn't in you without religion, it won't be there with it, either. You'll just have to do the same as the sociopaths who don't actually feel anything for others and put on the show.
It provides them with an ability to hope when nothing else does. It provides them with solace when nothing else can. It helps them see meaning in their suffering and loss, making it a little less horrible.
Holding their religious beliefs are why they need them. Without them, one learns to find hope without gods. One learns to deal with suffering and grief by simply experiencing them and recognizing that that is part of life.
But I know what you are referring to here. I've read quite a few brief, end-of-life biographies of people losing loved ones to Covid. They usually contain pleas to pray for them. And when the loved one passes, they say he's in a better place. Yes, that is comforting, but only because they have never outgrown the need to be comforted with reassuring fictions, which is where we begin in childhood.
You seem to see this as a gift from theism, but I see it as the opposite. The gift is to transcend those earlier needs by not indulging such comforting beliefs, or better yet, never holding them in the first place, but rather, to get to the business of growing up as intelligent, decent people without such ideas.
This is from an earlier post of mine, modified somewhat to reflect this discussion. This is what having to face reality godless allows one to do instead, and closer to what I call courage than what you are proposing derives from theistic beliefs:
Try standing up like the bipedal ape you were born to be, and look out into the universe, which may be almost empty, and which may contain no gods at all. And then face and accept the very real possibility that we may be all there is for light years.
Accept that you may be vulnerable and not watched over.
Accept the likelihood of your own mortality and finititude.
Accept the reality of your insignificance everywhere but earth, and that you might be unloved except by those who know you - people, and maybe a few animals.
Because as far as we know, that's how it is.
It's unpleasant at first, but be brave! Religion is comforting, but at a great cost. It's infantilizing, and costs you your only shot at an authentic existence.
A theist can never know the ineffable joy of doing good for goodness sake, with no expectation that anyone will ever know what good he did or reward him for it. When the atheist pulls over on a rural road to save a turtle crossing it, he know that nobody will ever know or care except him. That is authentic kindness, and authentic morality - goodness for goodness sake, and as close to a godlike experience as one can get.
So, it's worth making the effort to learn to face reality without god beliefs. Once you have faced the frightening, lonely, and bleak aspects of existence and learned to cope with them naturally, those feelings disappear, generally by young adulthood.
That's what I mean about theism creating the need for comfort through theism. And, of course, people never exposed to theism don't need to be told any of that. That is how they progress naturally.