Who did the Hinduism people worship?

They do even now. Brahma, Vishnu along with his nine incarnations Matsya, Kacchap, Varah, Nrisimha, Vaman, Parushurama, Rama, Krishna, Buddha, Shiva, and Mother Goddess Durga are the main Gods and Goddess of hinduism. Other Gods include Shiva's sons, Ganesha and Kartikeya, Hanuman, and Goddesses Lakshmi, Parvati, Saraswati, etc.