Atheist, secular, and religious homeschoolers who have no argument with evolution, struggle to find homeschooling books that accurately present science. Unfortunately, they often have trouble finding textbooks in all subjects that aren't saturated with Christian doctrine.
Well at least she realizes all homeschoolers aren't Christian Fundamentalist (sigh). But no, we don't have trouble finding secular textbooks just do a Google search for Secular Homeschool Textbooks and voila.
I have to agree that I did generally wind up using the same textbooks public schools used or at least the same publishers. But ..................it really wasn't a problem, and yes the books were pricey. But I am perplexed by the people who seem to think it is nearly impossible to find secular textbooks to use for homeschooling. I do agree that there is a market for secular homeschoolers and it is growing every day, perhaps some bright young homeschool entrepreneur will fill the niche.