The best parts of Rand’s Objectivism are thinly disguised elements of theistic Natural Law, painted over with a thin patina of atheism to make them palatable to a broader audience. Objectivism recognizes a great truth, also accepted by theistic Natural Law, that economic process works best in terms of matching needs to resources when it is conceived of as the interaction of self-interested peers. However, it arrives at this right conclusion for the wrong reason. Reality is objective and reason may be used to discover much about it. But reality is also bigger than anything we can see with either our eyes or our minds. Limiting our definition of morality, as Rand recommends, to asking the single question, “What’s in it for me,” falls well short of the better solution provided in theistic Natural Law as the Founders used it.
Why? Because without rights being a grant from the Creator, there is no logical stopping point whereby we may prevent ourselves from descending into the Nietzschean nightmare struggle for individual dominance, the surrender of all reason and morality to an eternal battle among selfish selves, irresolvable for lack of an Arbiter. This, BTW, is why Marxism and Objectivism end up at the same destination. Marxism, as a system of ideals, is nothing but a facade to get buy-in from useful idiots; the real game is what it has always been, what Rand and Nietzsche say it is, that some pigs end up being more equal than others, just because they can be. In the end, there is no separating Rand from Nietzsche, and therefore there is, apart from principles borrowed illegitimately from theistic Natural Law, no reconciling Rand with Christian theism.
The above is not the ultimate progression from Objectivism as you seem to proclaim with relish. What you state is against rational self-interest. It is not logical for individuals to destroy each other in a game of one-up-man-ship. You must see that Objectivism itself provides man the "logical stopping point."
How can you sleep at night when you claim that the most intransigent anti-Communist of the 21st Century was on par with Marx and Stalin?!