I couldn't care less about this issue, personally. I'm not a parent. If I was, I'd still not care; I've known about gay people since I was 9 years old. I grew up in a religious household and turned out just fine.
I also never said they shouldn't be able to opt out, quite the opposite. I said they should remove their kids from a school they feel isnt aligned with their beliefs. They have the freedom to.
The schools reflect the state of the world and societies. Again, I'd rather kids know gay people exist AND be able to do differential equations by 12.
Its not social engineering to accept the existence of gay people any more than it is to accept the existence of air, gas, liquids, solids, and plasma. Choosing not to acknowledge their existence does not make them nonexistent.
Again, I challenge you to really deductively assess this argument, apply it to curriculum 70 years ago, and reconcile the advances from then to now.
Please, don't try to push this fiction in bold. You wrote all of these responses pushing a particular side, so you most definitely care about this issue. Trying to now handwave and state you don't care is just being disingenuous or you lacking self-awareness. It is one or the other.
The rest of what you wrote is unimportant to me, because you have already handwaved it by stating that "I couldn't care less about this issue, personally". So no, I am not going to continue to argue with you on this, because you either can't be honest about your position, or you are unaware of your own feelings about this issue.