Russell claims that the main reason why people believe in God is because they have been taught from early infancy to do so. His argument does not really make sense because it assumes that people follow only what they have learned in their childhood and do not go through the process of filtering out material. Moreover, the whole body of evidence of people, coming from non-theistic backgrounds who have accepted theism goes against him. His argument also assumes that at all points of time, parents have been teaching their kids about the concept of Divinity. Moreover, his argument does not explain where did the concept of Divinity come from into cultures across the world in the first place.
Russell also claims that the next most compelling reason for people to believe in Divinity is that they wish for safety, for a feeling of having someone who takes care of them. This argument is flawed because it does not explain why people consider Divinity to have functions other than taking care of them. Even in Christianity, God is not just the protector of His creatures but also punishes them for their sin. If all people needed was a God who would take care of them, then he would not require each and every one of the theists to lead lives of restrain or balance. It is much more plausible to assume that if the people believed only in an artifact of imagination that protected them, they would have a very hedonistic concept of Divinity.