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In page Orthodox Judaism:

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Judaism never formulated a conclusive credo; whether it reflects a dogma remains controversial. Some researchers argued that the importance of daily practice and adherence to halakha (Jewish law) mooted theoretical issues. Others dismissed this view entirely, citing ancient rabbinic debates that castigated various heresies with little reference to observance. However, even without a uniform doctrine, Orthodox Judaism is basically united in its core beliefs. Disavowing them is a major blasphemy.[citation needed].