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human
Is Nietzschean philosophy anti-religion, or just anti-Christianity?

I'm not an expert, but I've read Thus Spoke Zarathustra and The Antichrist, along with bits here and there and it seems that much of what Nietzsche criticized about religion, what he called slave morality, was actually about Christianity. Christianity is unique, even among the other Abrahamic faiths, for its "blessed are the poor and meek" outlook and its negative view of sex, treating a celibate and monastic life as holier than marriage and children, while Judaism and Islam condemn a life of chosen celibacy and are quite positive on sex between husband and wife.

I've tried to find statements from Nietzsche on other religions, and while his statements on Jews are mostly talking about them as people (in the context of his opposition to anti-Semitism) and his statements on Buddhism are contradictory and misguided due to his knowledge of Buddhists being filtered through Schopenhauer, I did find his comments on Islam and Islamic civilization in The Antichrist to be very interesting.


>Christianity destroyed for us the whole harvest of ancient civilization, and later it also destroyed for us the whole harvest of Mohammedan civilization. The wonderful culture of the Moors in Spain, which was fundamentally nearer to us and appealed more to our senses and tastes than that of Rome and Greece, was trampled down (—I do not say by what sort of feet—) Why? Because it had to thank noble and manly instincts for its origin—because it said yes to life, even to the rare and refined luxuriousness of Moorish life!… The crusaders later made war on something before which it would have been more fitting for them to have grovelled in the dust—a civilization beside which even that of our nineteenth century seems very poor and very “senile.”—What they wanted, of course, was booty: the orient was rich…. Let us put aside our prejudices! The crusades were a higher form of piracy, nothing more! The German nobility, which is fundamentally a Viking nobility, was in its element there: the church knew only too well how the German nobility was to be won…. The German noble, always the “Swiss guard” of the church, always in the service of every bad instinct of the church—but well paid…. Consider the fact that it is precisely the aid of German swords and German blood and valour that has enabled the church to carry through its war to the death upon everything noble on earth! At this point a host of painful questions suggest themselves. The German nobility stands outside the history of the higher civilization: the reason is obvious…. Christianity, alcohol—the two great means of corruption…. Intrinsically there should be no more choice between Islam and Christianity than there is between an Arab and a Jew. The decision is already reached; nobody remains at liberty to choose here. Either a man is a Chandala or he is not…. “War to the knife with Rome! Peace and friendship with Islam!”: this was the feeling, this was the act, of that great free spirit, that genius among German emperors, Frederick II. What! must a German first be a genius, a free spirit, before he can feel decently? I can’t make out how a German could ever feel Christian….


It seems to me that Nietzsche and his philosophy is less anti-religion as it is commonly perceived, and more anti-Christian, what do you think?
gpt
Based on what he says in *GM* and *GS*, it seems like Nietzsche has grounds to object to any religion which involves investing yourself in a being who you take to be the author of your life’s meaning or moral value. 

We might clarify, though, and say that Nietzsche *really* only objects insofar as such religions affect “higher” types.  Such religions might be perfectly healthy for people with certain wills.  It’s not clear what proportion of society Nietzsche thinks is “higher.”