You're making the assumption that those people who were created unwell is all on God and nothing to do with the faulty genes of the parents or whatever other reasons. The prophets didn't teach to blame God for anything. Whatever we have is only a gift and a trust. As bad as it is for many people, the whole temporary life on Earth is only a tiny fraction of the eternal afterlife, and when it comes to getting entry there, a disability is only spoken of as a blessing in the scriptures.
Complaining this setup is pointless as we are in no position to question the sovereignty of God, and if we ponder deeply over it we'll end up saying God shouldn't create humans.
As for being petrified, we are only required to fear the justice of God, but remain optimistic about all else.
As I’ve said the design of everything is just weird.
If god is that interested in humanity and he cares what we do, eat, shag, think etc. Why make a universe so big and stick us on the outside of some tiny rock that’s exposed to so much danger?
Why go through the process of dinosaurs, wipe them out, then have us evolve from apes?
Why not inform us properly and not only do so through the words of a couple of people in the desert so long ago?
How are tribes in the Amazon supposed to follow it when they don’t have contact with other people?
Why make it so unbelievable and then send those that don’t believe it out of pure logic, to eternal hell fire?
Why have your only son or your prophet tell the world everything they need to know but not include 100% of science that’s proven to be correct.
The Abrahamic religions got how the universe came about, how man got here, gravity, the sun etc. all totally wrong.
Why make us attracted to the other sex and then say we should pluck our own eye out before we look at a woman with lust we’re not married to, as it’s the same as adultery?
Why create a world in which babies die of starvation and of their own shit, in total misery?
Why have us evolve from a particularly violent group of primates?
Why even have the earth in the first place? Why have mental health and disabilities in the first place?
Why is the violent and disgusting execution of a human being in the desert the best way to teach the world morality?
Why have a war lord paedophile prophet the same?
I’ve read large parts of the bible and Koran and I’m sorry mate, within a few pages you can tell it’s the imagination of an ancient idiot.