The only feasible libertarianism, and I hesitate to call it that as it is something more like minarchy which I know not all libertarians are in favour of, requires non-governmental actors to fufil many of the roles government presently does which are non-market or corrective of market failures, objectivism is contra most of these roles altogether because they can involve altruism or social conscience or something other than narrow selfish interests.
There is also a working out of objectivism, taking it to its logical conclusion, in which it reaches socialist conclusions, now it could be something which people unfamiliar with socialism in any but a prejorative way or from second hand (usually capitalist) sources wouldnt recognise but its socialist none the less. Its in authors such as Oscar Wilde's Soul of Man Under Socialism. It also features in Dorian Gray but its a philosophy which that tag. Wilde believed that everyone operating out of purely enlightened self-interest socialism was the only feasible system. So did Edward Bellamy, although his corporatist, modernist vision doesnt appeal to many socialists now and even in its day movitated counter ideas like William Morris' News From Nowhere.
I dont believe that socialism is perfectionist, neither is marxism, capitalist ideas are more perfectionist as they actually hinge on ideas about approximations of perfection in competition, consumer and producer information etc.
The contradictions between Marx and Christian spirituality remain because Marx was an atheist, I think its less of a contradiction because I personally believe liberation theology with certain provisions or caveats, usually the same I'd apply to socialism, certainly less of a contradiction than objectivist-christianity.