Seigneur,
You made some strong, very controversial assumptions without unpacking or defending them. It's up to you, but you won't win anyone over or make a meaningful contribution to discussion that way. I am not a libertarian, so I'm not here to defend libertarianism per se or that particular book, but there are worthwhile ways of criticising libertarianism and classical liberalism and less worthwhile ones. Collapsing classical liberalism and libertarianism into Objectivism is not accurate or helpful, when classical liberalism clearly predates Ayn Rand by centuries and even in the post-war revival of strands of classical liberalism, known as libertarianism, Rand was one amongst a host of figures, from Albert Jay Nock to Murray Rothbard. Nor is making the hugely simplistic comment that libertarianism is selfish and Christianity unselfish, therefore they must be incompatible, likely to add much to meaningful debate. There are all sorts of issues that would need addressing to conclude that, as Daniel touches on, like what policy best contributes to human welfare and what is the moral role of the state compared with the role of the individual (after all it is very simplistic to just equate state action with the individual virtues).