Look, this isn't about "modern gender theory", although that does sound very scary.  We've only got the last several hundred years of history to show that forcing gay people into the closet and denying them the right to live a normal life is harmful to their lives and society as well.  

"The ultra religious views on gender and sex are about as factual and proven as any modern gender theories and Id sooner have that taught to my children."

No, they're not, and claiming that Biblical morality is "about as factual" as our understanding of sexuality, pregnancy and disease is silly.  This is a human rights issue, where we teach children to tolerate people who are different.  And teaching children the basic facts about sexuality, pregnancy and disease is a human right, and our responsibility as a society.  Children have a *right* to learn what science has discovered about these issues.