In this work, the origin and development of Christian dogma, which is understood to be the authoritative system of Christian doctrine that had formed by the 4th century A.D. In the present work, (Vol. 1) is to explain fully how the doctrine of the Church developed the doctrine of the Trinity and of the two natures. Also shown is the imperfect beginnings of Church doctrine, especially as they appear in the Logos theory derived from cosmology, were subjected to wholesome corrections — by the Monarchians, by Athanasius, and by the influence of biblical passages, which pointed in another direction. Nor could the Hellenic contrast of “spirit” and “flesh” become completely developed in Christianity, because the belief in the bodily resurrection of Christ, and in the admission of the flesh into heaven, opposed to the principle of dualism a barrier which Paul as yet neither knew nor felt to be necessary. The resurrection of the flesh shattered the energetic attempts Hellenic complexion to the Christian religion.