How is behavior NOT a product of ones environment? One only has the information to make decisions about the world they have gathered from their environment. N

How is behavior NOT a product of ones environment? One only has the information to make decisions about the world they have gathered from their environment. No one is born knowing correct way to behave. As an example do you think everyone in the Middle East is Muslim because they've made the decision to be? Or because that is what their environment has taught them is correct.