The third book on my 100 books list is Atlas Shrugged, which I am in the process of reading through again right now.
Thomas Sowell, like Rand, is an example of someone who ends up promoting a worldview that is consistent with the Bible and Christianity but without being a Christian. All that is required to make this happen is for a person to acknowledge the reality around them and then be rationally consistent with that reality.
P.S. It is not impossible that Sowell is a believer but he seems to have made an effort to not let anyone know whether he is or is not and my default is to give a man the benefit of the doubt and assume that he is not a believer until such time as I have good evidence to the contrary.