If Krishna is not the God, than the whole Bhagavad-Gita doesn’t have any value. Why would the greatest personalities, learned scholars, and holy saints worship Bhagavad-Gita if it only contains the words of the ordinary person? Srila Prabhupada often explained that Krishna covers His intimate associates with His spiritual energy Yogamaya to make them to forget His real identity (Yogamaya is totaly different from the material energy Mahamaya, who keeps us, conditioned souls, under the spell of illusion). Otherwise, if they think of Him as the God they will treat Him with too much reverence. In this way Krishna and His associates will not be able to share the intimate pastimes. If devotee wants to have relationships with God as his/her helpless child, Krishna reciprocates to such a sentiment and give this devotee an opportunity to do so. Just like Nanda Maharaja and mother Yashoda are given the opportunity to take care of Krishna, feed Krishna, and put Him to sleep every night. They will not be able to do so if they thought Him to be the God, they would be in too much awe.