Astonishingly enough, quite a huge part of the population don't seem to think this as important. This honestly shocks me.
What about ill-informed, irresponsible adults? 30% of Americans believe in astrology [1]. A growing number are anti-vaxers.
The number of people that believe some amount of utterly batshit things is not small!
Let's list them:
1. Cocoa beans 2. Coffee beans 3. Cola Beans 4. Macca 5. Ginkgo
and the list keeps going and growing every decade.
To illustrate this, I started drawing recently starting from scratch. It’s distressing to realize how much my own brain intercepts and modify what my actual eyes see, to show me a picture that isn’t reality (proportions are changed for instance, we tend to naturally draw faces without forehead when the forehead is actually half the face).
The point I’m trying to make is that the brain is very weird and biased already to make all kinds of mistakes or overlook things without adding magical thinking on top. Believing things like “it’s gods will” or “it can be prayed away” would seriously bias and interfere with treatment or available evidence, I feel.
Without the time of birth one can say very little, because the time of birth configures all of the 12 houses of the chart. The houses reflect ones experience in material reality. The sun in the 1st house in Libra is vastly different than the sun in the 12th house in Libra, to use a simplistic example.
But yes, a careful analysis of a natal chart that includes an accurate birth time and place of birth would very precisely determine someones personality. It could also determine the personalities of the parents, indicate the nature of partners and friends, health, the home and work environment and just about anything else you can think of. Not in precise specific detail (though one _can_ get specific), but thematically. And further, one can project this chart forward through time to determine future events involving said themes, also with great accuracy.
Unfortunately however, the weakest link in astrology is the astrologer, as has been said time and again. It requires extraordinary skill and learning gained through years of study, like any technical craft.
If they're not hurting anyone else, people can believe whatever they want. It's by having people try out large amounts of disparate beliefs that we can best figure out what works and what doesn't. Homogeneity is death.