Nah, Friedrich Wilhelm Nietzsche is just a boogeyman to men like Marcus, and the abyssal intellectual depth of the poster is revealed by the fact that he misspelled the name twice in two freaking lines.
The scary thing, as you say, is that Nietzsche seriously grappled with the core ideas of Christianity, compared them to the only other thing he knew (the Greeks) and found them lacking. Not just in the usual protestant way -- oh, the true and pure ideals have been sullied by a corrupt Church, which is what protestants and heretics had been already saying for centuries.
No, Nietzsche goes to the very core of Christianity and finds it to be primarily based on what sociologists today call compensators: things that make people feel better about their (lower than desired) position in the world. Again, ST had a bunch of posts on this that explain it better, but the idea is that Christianity's appeal lies in the denial of the importance of material success of any kind. Worldly power is vain, sex with lots of women is a sin, money will lead you to hell, etc - basically everything people normally crave in the world (money, sex, power) is proclaimed to be bad, and traits associated with weakness (meekness, dependence, submission, low material possessions) is proclaimed to be a virtue. It was on this basis that Nietzsche calls it a
slave morality -- and, seeing it as either merely making a virtue out of necessity (the case for most), or
worse, for those few with potential to power, a refusal to grasp at and reach for one's true power, has nothing but the vilest contempt for it.
Nietzsche recognized before the sociologists that material wealth and comfort allays the need for such compensators, which leads to disbelief. The problem with Nietzsche is that he didn't really have anything to put in place of the fallen idol - his idea was to rush and burn the carcass, something is bound to take its place. The Romantic in him envisioned a renewed rise of the Aristocratic Greek ideals, but at some level he must have been aware that the cultural impact of Christianity is indelible. If you read his
Also sprach Zarathustra, you will see how much contempt he has for what he calls the "Last men" -- for us: (dis)believers without strong ideals, who are not ready to kill for what they believe, who care mostly about their physical comfort. He rightly calls us animals, mere cows. The Christian in him recoils from the hellish vision, and he proclaims an apocalypse brought about by a triumphant messiah: the Übermensch, after which everything will be alright again - true heroes will exist, emotions will be strong and real, burning and freezing, not lukewarm.
Bah, these Romantic utopians... No better than Christians, really.