Earlier quoted context omitted.
No it's not. Why wouldn't an atheist want an afterlife?
Christopher has stated multiple times that he finds the Christian idea of heaven unappealing. Furthermore, if the Christian heaven does exist (which in turn implies that Christian doctrine is true), Christopher is most certainly in hell.
If the Christian heaven does exist, it does not imply that all Christian doctrine is true, only that some is true.
And there is a lot of contradictory Christian doctrine. By that, I am not saying that Christian doctrine is self-contradictory, I am only pointing out that several different Christian denominations have doctrines that contradict each other. According to some denominations, Hitchens would indeed be in hell, and according to others, he would be in heaven.