I just want to add:
Some children are naturally anxious (some have medical problems that make them so). Anxiety and hysterical inability to cope with small challenges seems particularly widespread today, and statistics say that’s certainly not because we’re becoming more religious (since the phenomenon is happening in places that are becoming less religious). I know one person with clinical anxiety who literally cannot engage in a conversation if someone disagrees with her position on something; she has to ask them to stop speaking, or she will leave the room, because it’s too distressing for her when the outside world doesn’t agree with her internal preference for how she’d like the outside world to be.
I can’t speak to the atheist whose video you watched, and why he, as a specific individual, considers himself emotionally scarred by having once believed in hell. Especially considering he claims that this belief wasn’t pressed upon him from the outside, but he logic’d it out himself. (Perhaps that’s part of it, actually; if no adult framed it for him in a healthy way, maybe he was left wrestling with thoughts of hell alone, which isn’t good.)
But honestly, learned fragility is a thing. And most humans are actually more naturally resilient than modern western culture teaches us to think we are. It makes our problems worse to tell ourselves that what frightens us “scars” us; it’s honestly, literally, a matter of how we frame things for ourselves.
So again, no. Hell is real, just like traffic and hot stoves and bears, so it’s loving to teach our children the truth about these things, in a gentle, well-framed, and age-appropriate way. It would be child abuse (by neglect) to not tell children the truth about these things. And I reckon the important thing will be making sure to help frame each topic for your children, at an age-appropriate level each time; don’t leave them alone to try to figure out such serious topics for themselves. Educate yourself about the truths of the faith, and about how to communicate these truths lovingly to children, and then lovingly teach your children.
And ideally, for your children’s sake, keep them as far as possible away from cultural influences that teach them to feel “scarred” by things that children coped with perfectly easily for many generations past. Teach your kids their own resilience, don’t teach your kids that they are weak and helpless and grievously injured by exposure to uncomfortable or difficult realities.