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I’m homeschooled, and this is my science textbook. Give me strength, /r/atheism…(r/atheism)
This may take a while, and it will not be easy, but the end results will be worth it in at least one way. Go through the first couple chapters with a fine-toothed comb, picking them apart bit by bit. First, start off with factual errors. Any time it makes an assertion about something you can verify (anything it states as a matter of fact), fact-check it against Wikipedia. Any time you find an error, write it down along with the correction and a citation. Next, run through them again, this time looking for logical fallacies. This one will be a bit harder, but the knowledge and practice you gain from the experience will be invaluable.
After you’ve done this and worked up a substantial list, go to your parents with the book and the list (a print-out if you can) and tell them that this book is a waste of money, being wrong on so many things, logically and factually. Mentioning that the primary author’s degree (Dr. Jay Wile) is not in biology, but in nuclear chemistry, might help too. I mean, would you expect a mathematician to be able to understand and teach nuclear chemistry when he has no degree or special experience in the field? Why, then, would you expect a nuclear chemist to be able to competently teach biology? The other primary author, Marilyn F. Durnell, appears to have no special degree whatsoever. The 1-star reviews on Amazon (find them here) can get you started with a list of some of the dishonest stuff you’ll find inside.
After giving the book a thorough reaming, ask your parents/guardians to get you a real text book, and suggest they try to get a refund on this one. Whether or not they take your advise and/or suggestion, however, you’ll have already learned a great deal on the topic just by finding out how wrong this piece of trash is, and that is knowledge that they can’t keep from you.