As someone who was a closeted queer teacher in conservative public school district: don't do it. I teach at the college level now - if I ever wanted to go back to teaching K-12, I would specifically looking for districts who are affirming and supportive of both queer students and faculty. I would avoid private Christian schools altogether.

Take a job offer where you can be yourself openly. If you want to help support kids in your hometown, see if there's organizations there already doing the work and ask how you can help.