GENESIS OF GOD-CONCEPT

GOD/Bhagwan was mentioned in the Vedas - four boys who spoke knowledge in Vedic Sanskrit, while imparting concise information on Finance/Atharvaveda, Health/Ayurveda, and others (Rigved and Samved). They described a number of gods, but were not (neti-neti) clear on Almighty Godhead. Precise information on this was declared, explained with Cosmic Manifestation of God Almighty as Virat Vasudev, showing everything, everywhere, everyone, including universe-muitverses inside Lord Vishnu, from Mahashunya/Singularity with brilliance greater than thousands of suns, shining at-once with OM-vibration (akin to quantum field theory of modern science) to its burst-expanding Consciousness of all gods and all Existence, recorded in Srimad Bhagavad Gita, demonstrating that God is indeed ONE and associable to humans as Lord Mahavishnu.

WHY WORSHIP GOD IN HUMAN-LIKE FORM?

As humans alone are looking for God, God asserts cosmic uni-multiverse form with human look (Srimad Bhagavad Gita), inspiring the devotees to become God by performing great deeds and thanking the Cosmic God, rather than flaunting the achievements to intimidate fellow earthlings. Basically, one ultimately becomes who one admires because virtues are imbibed of who you pray, remember or follow. When ancient rishis/vedic-scientists studied astronomy (stars, planets, moons, galaxies, constellations, etc) with dedication, God accepted this as His admiration and assumed a Cosmic Virat form from His eternal formless true-conscious-blissful(Sat-Chit-Anand) state, as per revelation in Srimad Bhagavad Gita.In this Cosmic Form, God declared that this had never been revealed before that time (before beginning of the Mahabharata War).