My second husband, never a JW, had a degree in history and religion. He taught Bible History in public school. His curriculum is at the link below, or google "Teacherweb Bible History," and the first link to appear will take you to his lesson plans, etc. In fact, my second husband knew more about the Bible than anyone else I ever met, including clergy AND JW's.
If you want to teach your children the Bible without religious indoctrinationb, I recommend that you print out these lesson plans, read the Bible with your children, and do the workbook assignments. Your children will not be the only ones who learn something.
If the curriculum seems simple-minded, remember it's for high school kids. Because Bible History was an elective, my ex told the school administrators to send him the worst students, and that they would learn in his class. He incorporated paragraph writing, geography and history into the course.
teacherweb .com/TN/BITS/ BibleHistory /h0.stm
Regards,
SandraC