Hindu's have 1 god that they consider formless and there are literally millions of other gods that are actually just parts of their 1 supreme god. some put their worship to specific gods for certain...
brahman Most hindus are polytheistic. So there are many Gods and Goddesses. Vishnu, Rama, Krishna, Shiva, Ganesha, Kartikeya. Among Goddesses, we have Durga and her forms including Kali, Lakshmi,...
No one can tell exactly when the concept of religion started. Although, based on evidence and history, we can choose to accept or not the Hindu god as the first god.