Now that Nephi's train of thought has turned to witnessing to the truth of Christ, it is a very short step to his testimony of Christ, which now occupies his text. Nephi sees Christ as the culmination of the preparation laid by the law of Moses. Nephi understands that the elements and practices of the law are symbolic of the mission of Christ, as connection that he understands implicitly from his vision of the mission of the Savior, as well has his prophetic understanding of Isaiah's Messianic prophecies.
Note that Nephi does make a conceptual division between God and Christ, understanding that Christ is the end of the law of Moses, and all things "which have been given of God from the beginning of the world." The attribution of causality to God for the typifying of the mission of Christ underlines Nephi's understanding of the separation between them. This is important for the later Book of Mormon passages that might be read as conflating the two.