Okay, Nietzsche was really angry. It is quite obvious that the book is a tirade against Christianity, so the content is not surprising.
Some approaches are interesting, such as the treatise that the church is the opposite of the gospel by establishing an organized church with a priesthood - which is actually what Jesus wanted to leave behind. But all the further arguments for it completely miss the point and he just gets worked up about priests and so on.
I didn't have the feeling that he actually had anything to say to me as a Christian, but I shudder at the consequences of his morality and ethics. Besides, he calls Swabians the "best liars in Germany"