I have a relative who is deeply religious. I know I would not agree with her on, for example, evolution. But she is loving and devoted and her two daughters have received tons of time and investment from her in their education, far more than they would receive in a public school.
I obviously haven't, like, tested her kids, but they do seem smart and well adjusted. I'm not really worried about the limitations on their scientific learning — it's not ideal if they are skipping some evolutionary biology (I actually have no idea but I assume they are) but they are going to leave home, go to college in a very secular country and get to learn that stuff. I'm sure with the internet they are already widely exposed to what science has to say about e.g. the creation of the universe (which, honestly, how many high school students could walk you through?).
By the way, I don't think there is anyone homeschooling with the "only textbook is the Bible" and in most states you need to file a curriculum every year that gets reviewed and approved.