I'm not sure if you really want an answer to that, but I have one anyway. Yes, Christianity (and all its' sects and branches) share a delusion and that concerns sacrifice...human sacrifice to be specific, which is not and never was a method to atonement.
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The Sacred Executioner: Human Sacrifice and the Legacy of Guilt by Hyam Maccoby, p.98~106
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The Passover sacrifice, as it happens, was not an atoning sacrifice in the practice of Judaism. It was rather an affirmation of thanks to God for the deliverance from Egypt and for the Covenant. It is true that the Passover sacrifice of Egypt (as the original sacrifice described in Exodus was called) was a protective sacrifice by which the disaster decreed against the Egyptians was warded off from the Israelites. But the Passover sacrifice of the generations had none of this aura of fear; it was carefully distinguished from the Egypt sacrifice and had different laws for its observance. This is not a trivial point, for it applies to the Temple system of sacrifices as a whole. This system was not directed towards salvation. That had taken place long ago, at the time of the institution of the Covenant.[/FONT]
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[FONT=Times New Roman, Times, serif]This piecemeal, rational approach was due to the conviction that the great sacrifice (the Akedah) had taken place long ago, that the Covenant had resulted from it, and that the worshipper thus lived in spiritual security within it. The Christian attitude to sacrifice, on the other hand, arose out of the shattering of this sense of security (or, more accurately, it arose from the standpoint of those who had never acquired it). To the author of the Epistle to the Hebrew, the fact that the Jewish sacrifices had to be continually repeated showed that they were imperfectthat they left the problem of sin essentially unsolved. What was needed was a solution that would end the problem of sin once and for all. Christianity, in fact, was a return to the condition of primitive dread, in which the primary problem is not How shall I improve my deeds? but How shall I be saved?[/FONT]
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[FONT=Times New Roman, Times, serif]It is therefore quite mistaken to see the Christian concept of sacrifice as arising naturally out of the Jewish sacrificial system, or as providing the climax to which it tended. On the contrary, the natural tendency of Judaism was in Christianity catastrophically reversed. The whole tendency of the Jewish system was to reduce the importance of sacrifice; the very term sacrifice is a misnomer in relation to the majority of the offerings of the Jerusalem Temple, where in general the tone set was that of a communal meal with God, with the aim of thanksgiving rather than of redemption. In Christianity the age-loving Jewish process of sublimation disappears as if in a sudden bout of psychosis. We are back at the primitive level at which the abyss opens and panic requires a victim. It is not surprising in these circumstances that the human victim reappears, after so many centuries of animal substitution. It is not surprising either that the theme of mass redemption reappears, so long after its replacement in Judaism by the theme of individual self-improvement.[/FONT]
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[FONT=Times New Roman, Times, serif]But this air of sudden psychosis is really misleading, because Christianity is not an incident in the history of Judaism, but in the history of Hellenistic religion.[/FONT]