I'm not. On the contrary, I think Nietzsche ranks among the nineteenth century's leading geniuses, to the point of being prophetic. Yes, he was a prophet of doom with a zoom lens, and his insights into the "death of God" and its inevitable consequences are prescient and visionary.
Having said that, Nietzsche's overall assessment and condemnation of Christianity are largely erroneous and misguided. Why? Because he did not criticize what Christianity is but what Christianity had become.
As Max Scheler outlines in Ressentiment, Nietzsche's castigation of Christian values is more of a castigation of nineteenth-century bourgeois values than an accurate assessment of true Christian values. Granted, Scheler's thinking was heavily imbued by the rather strict Catholic perspective he held at the time, but this does not diminish or weaken his overall evaluation of Nietzsche's misguided claims about true Christian values (bold added):
". . . the greatest mistake would be to interpret the Christian movement on the basis of dim analogies with certain forms of the modern social and democratic movement.
Jesus is not a kind of “popular hero” and “social politician,” a man who knows what ails the poor and the oppressed, an “enemy of Mammon” in the sense that he opposes capitalism as a form of social existence.
Yet Friedrich Nietzsche's own conception of Christianity is strongly influenced by this widespread Jesus picture, which was propagated by Christian and non-Christian socialists.
Therefore he thinks that the motives and arguments which set him against modern Socialism and Communism also apply to Christian morality and its genius.
But Nietzsche's attack touches Jesus and the core of Christianity as little as the praise of those “socialists,” since both share the same mistaken premise.
Christianity does not contain the germ of modern socialist and democratic tendencies and value judgments. Nor did it ever affirm the “equality of souls before God,” to which Nietzsche always points as the root of democracy—except in the sense that God's judgment on men is preceded by an elimination of the value delusions which are due to human situations, to human narrow-mindedness, blindness, and selfinterest.
But the notion that all men are equivalent “in God‟s eyes,” that all value distinctions and the whole value aristocracy of human existence are merely based on anthropomorphic prejudice, onesidedness, and weakness, is reminiscent of Spinoza and entirely foreign to Christianity."
Sadly, most Christians have utterly lost the plot when it comes true Christian values!
Thus, what parades around as Christianity and Christian values today are the exact things Nietzsche so vividly and accurately condemned.