Being truly God, no manifestation as a human changed what He always knew. His appearance as a baby safeguarded Him. "Mary kept all these things in her heart." He came to fulfill the Law, not destroy it, therefore what He did outwardly gave the appearance that He was an observant Jew. He already and always knew everything - language, math, history, politics.

His choosing to go His own way, God's way, was to bring the world back to His Father. He humbled the exalted, and exalted the humble so that all may see we are equal in the sight of God. Some followed, others didn't, to their own demise.