Though the lecture came a little too late in our course, precisely 4 days before it was getting over, this was a session we really found interesting.
Starting from 'Animism' (attributing soul to inanimate objects and worshipping them), to 'Anthropomorphism' (visualising the inanimate objects with souls in a human form), to 'Henotheism' (atrributing creation, preservation and destruction to one God) the religious beliefs came a long long way.
The Vedic pantheon of Gods were different from those that are worshipped today. Indra, Agni, Rudra, Surya, Varuna, etc., most of these Gods were formed from elements of nature. Rudra later was given soumyata aspects and came to be known as Shiva. Fire worship was popular at this time and ritual sacrifices were often carried out. The head of the people was known as Narapati, and later a person called Bhupati became the head of the land (property was not a determinant earlier).
The Rig Veda dates back to 1200 B.C. Each Veda has a Samhita section, a Brahmana section (800 B.C.) Aaranyaka section and Upanishads (600 B.C.)
The priests appointed the Kings to be the rulers of the people, and thus they were above the kings themselves technically. and this was also the reason for a nexus between the Brahmins and the Kshatriyas. By around 500 B.C. the priests fade in importance when the kings emerge stronger and doubts were cast on the efficacy of the rituals and sacrifices. More important was atmayajna, and this was the emergence of the Upanishadic thoughts. The questioning of the fire sacrifices came from the Kshatriya caste. Kings built huge temples as places of worship, and thus the shift from fire worship to temple worship.
It was during the Period of the Epics that talk of temples or tirthas (place associated with water for prayers and offerings) first emerged. kshetra was also a new term which referred to 'potent spaces'. As opposed to this Vedic literature has no mention of a public place of worship and there was no sanctity attached to a specific place.
Between 1st cent B.C. and 1st centurey A.D., acculturisation processes resulted in the Gods being given totem symbols and tribal symbols- like the cobra, turtle, lion, etc. These became vehicles of Gods, or symbols associated with Gods.
The priestly clan found new roles for themselves within the temples. there were hotirs who culled out verses from the Rg Veda, udgatirs who were specialists in the Samaveda and sang and chanted during rituals, advaris physically handles the ritual processes, and brahmanas were the experts in all the vedas and they supervised the entire ritual processes.
The other interesting point made was about how with improved connectivity, opening up of trade routes and newly acquired wealth, Vaishyas and Sudras also had money, but no status in society. They found solace in newer heterodox religions like Jainism and Buddhism.
The Bhagavad Gita itself was a later addition to the Mahabharata, for the common people. It was to help the common people battle out the Kurukshetras in their daily lives. As Jainism and Buddhism was about renouncing the world, Bhagavad Gita was pitched at another group, those common people who might not want to renounce, but want to carry on with the simply daily lives.