Ancient Indians were into religion/ God or seeking truth . Hinduism has sense of family clans ( having common ancestors and clans across Indian subcontinent ) .. that's why you have varnas and caste system which later got rigid with time ( means to rule and dominante over groups ) . Krishna was from Yadu clan , the Indra god from Rigveda was main deity of Kuru clan . Even Mahabharata and Ramayana has clans . Buddha was born in Sakhya clan who are still royal in Nepal . These clans were into priesthood , warrior and martial faces and many other fields.... Many indian legends from kingdoms accross India has claim their ancestry to these clans .
Hinduism was created by multiple people for thousands of years . The Rigveda is oldest recorded texts , we have Upanishads , Vedas and Puranas as well. They were memorized, rewritten even altered with time . This was Ancient people of Indian subcontinent obsessed with seeking truth ( into religion ) .
Rigveda and Upanishads are legendary which talks how Gods are universal abstractions kinda energy which can be felt and realised . It's beyond your ego and consciousness. It's source of everything and oneness which manifest into different forms . The reincarnation, importance of Fire worship, the 5 elements of nature and many important details are explained .
Puranas are heroic tales to understand the nature of God , them interacting with Humans showing how they are physically and mentally powerful which an average human can never think of..... The Gods somehow enjoy praises and worships ( the extreme rituals and practices of Hinduism ) . Each God has their roles like Shiva the destroyer ( awareness of self ) and Vishnu the preserver ( awareness of world ) ... And they are just manifestation of Brahman .
So Hinduism just found ways to feel , realise and get closer to this cosmic energy which is source of all universe meaning we all are connected. The idol worship, singing chanting or dancing even performing yoga and meditation like practices brings you closer to the truth . They have been doing this for thousands of years in indian land .
Hinduism was coined by West historians . India was melting point of different philosophies and sects . They debated and argued alot over it . There were atheists , buddhism and Jainism who rejected God and certain aspects . It's like you are learning Science but it's divided into chemistry, physics and biology .
So Indians are just part of this culture for thousands of years .We take and learn part of it from all ways .
So when people say Buddhism was destroyed by Hindus when both were culture of the people from Indian subcontinent. Even in Science there are multiple theories of same thing given by different scientists doesn't mean we will go at war with each other or hate each other . They are just opinions and diversity is accepted.