Yet as I read Nietzsche's argument in The Antichrist now; it seems to be directed against mainstream, modern, Establishment materialist Leftism - against 2020 systemic totalitarianism triumphant - rather than against Christianity as I understand it.
Indeed, read this way, The Antichrist is a brilliant exposition of the dominant reductionist and secular negative- ideology that has infiltrated, subverted, inverted and (since the global church closures of least year) all-but destroyed institutional Christianity.
Nietzsche's criticism's of Christianity are characteristic of modern, mainstream, secular, bureaucratic Leftism: The morality based on resentment; the incoherence of equality; that mass inculcation of 'pity' which is designed to paralyze with guilt; and to induce self-hatred, nihilism, despair and the desire for death (eg. abortion, euthanasia, assisted suicide).
Nietzsche's assumption was that there was only 'this world' and he failed to recognize that, if true, this negated all possible justifications for Life of the kind he sought. His diagnosis of Ahrimanic evil was exact and prescient.
But - at the time of his final dementia and mutism - he had not recognized that his alternative of a morality of Life (by which he meant individual spontaneous instinct) was subhuman, selfish, destructively short-termist - and by nature and merely atavistic, regressive and Luciferic.
In other words, Nietzsche had not got beyond a negative critique based upon unexamined assumptions. The development of human consciousness means that the Luciferic is unattainable (even if it were desirable) and the Ahrimanic inevitably defeats it. Thus the German National Socialists (who revered Nietzsche, and issued Zarathustra as a Bible-equivalent) began with a philosophy of Life; but inevitably ended with escalating bureaucracy.
This failure of the Luciferic is why the actual effect of Nietzsche on the atheistic anti-Christian culture which followed, has been to lead towards the Sorathic world of spiteful destruction - a program of civilizational/ national/ personal annihilation - instead of his hoped-for fantasy of pagan strength, courage and dominance.
What Nietzsche should have done (and perhaps would have done - given more time; and an intuitive recognition of such realities as God, creation and life beyond mortality) was to move on from his negative critique of historical-actual church-dominated Christianity, to apply his creative insights - his direct-knowing - to remaking Christianity instead of trying to destroy it.
As things stood; Nietzsche was using a double-standard - applying his 'methods' only against Christianity; and not against the assumptions from-which he critiqued Christianity.
Nietzsche's own method, if thoroughly applied, would have led him back to Christianity - but Christianity of a very different nature than the one from which he began.
Also, as I have said before, I think it likely that Nietzsche was himself 'saved' - i.e. that after death he chose to follow Jesus Christ to resurrected eternal life in Heaven.
Why? How? Well, in a nutshell, what Nietzsche had against Christianity was that he believed it was not true.
If when, after death, Nietzsche discovered that Christianity was true; then a Man of his creativity and honesty - and with his passionate human motivations - would likely have chosen active, eternal, interpersonal Life in Heaven; rather than the anti-Life lies, ugliness and sordid sins of Hell; or the living-death, un-conscious, blissed-out passivity of Nirvana.