Are Tuttle twins books religious?

Are Tuttle twins books religious?
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If you are a parent or educator looking for educational books that can teach children about economics, history, and government, you may have come across the Tuttle Twins series. This series of children's books has gained popularity in recent years due to their focus on teaching young children about principles of free-market economics, property rights, and individual freedom. However, there has been some confusion regarding whether or not the Tuttle Twins books are religiously-oriented, and if so, to what extent.