The beauty of homeschooling is that you teach your kids how to think, not just regurgitate statements made in books that may or may not be true.
Instead of having a coronary and running to the AP and getting all kinds of attention for being a crybaby, just discuss the issue and move on. And find some other source for your biology books.
So what if the homeschool market is dominated by Christian worldview curriculum? That’s the great thing about the free market. What are they going to try to do now? Force the Christian books distributors to print non-Christian material?
Why blame them that there’s not much out there in the way of any other choices? It’s not their fault that no one else is providing secular curriculum.
Worth repeating! If your opinions won't stand up to a little questioning, why have them? I plan to teach my kids about evolution, but it will be as a theory; and I'm going to present them with the arguments against it as well. If they're not able to deal with that, then I'll know I have failed horribly.
No one is supplying secular curriculum because there isn’t much demand for it.