People who don't understand how the system works inevitably fail at making it continue working when they intentionally tinker with it. The system works on math, among other things.
Math is useful to anyone, anyone at all. Every profession requires math to one extent or another, even if because at the end it's about efficiency or profit. You may try and argue that not every profession needs to understand, say, calculus: but that doesn't make calculus useless in that profession. Quite the opposite, calculus represents a fundamental understanding of the concept of "change". If you want to say that's useless in any situation, you are free to live in a stagnant world in the middle of nowhere.
If you say that understanding science is worthless, how do you expect to be competitive in today's society? If you don't understand how something works, you cannot make it work better. Not in any meaningful scale that anybody else could not accomplish. What do you want to bet that technology is not everywhere, all the time, in today's society? "But that's not scientific, that's computers and stuff!" you might say, but it is. Computer Science is a legitimate field.
You also seem to be under the impression that English is the only necessity for communication. If that were true, you'd know what I mean when I say that the total electrical flux passing through a closed surface is equivalent to the charge contained in that surface without needing to consider even what a charge is.
Enzymes, chromosomes: All of biology is taught in the off chance that it becomes interesting. If it isn't, then you'd make a terrible biologist.
Chemistry is taught for the same reason, and because it's exceptionally important. If you can name something in your every day life for which chemistry has no relevance, either you're wrong or you used chemistry to pick something that is explicitly absurdly difficult to explain with chemistry.
Physics is often taught and rarely understood. Basic physics is an almost irrelevant subject when inspected under the light of Calculus. Given two or three base formulas, all of Newtonian mechanics can be derived without resorting to anything weird. Allowing weirdness, all of Newtonian mechanics can be summed up in one equation. That's accurate enough to launch things at the moons of Saturn and actually hit.
Math: If algebra seems useless, you aren't even attempting to use it. And yes, you can get away with that: you only technically need to know how to pay taxes and not die, really. So, yes, I'll admit learning how to solve quadratic equations by the dozens is, in fact, probably useless. If you think science is about memorizing formulas though, you've completely missed the point of mathematics. Even if I did not know the quadratic formula, I could rederive it in 5 minutes or so (most of which would be writing), because I understand algebra. No one bothers to memorize formulas in mathematics: It's about how one thinks.
If you want to live without learning how to think, again, it's your choice. But do you think society has a use for that? Manual labor is worthless to large corporations, unskilled jobs can be exported to India, and people who can't do anything remotely interesting are a dime a dozen, which is about what you'll be paid for having a skill set that amounts to "nothing special at all". Any profession worth doing requires at least understanding that math is a study of understanding -- and anyone who thinks it's all about the formulae does not understand that. The formulae are at most shortcuts to the end results.
Someone who can plug numbers into formulas is worth at most $2000, total. For their entire lives. Most of the times you could go down to about $100 or so. That's the price of a calculator that can do anything involving "plug numbers into formulas math".