Gurung what is your religion?

Hello there, I'm 23 year old from a gurung family and I'm a raul lamchane gurung. I was born and raised in India. And I have a question regarding our religion. My own family follow hindu religion and pray to our family god we calls her maharani. But my father family followes Buddhism and family god and also celebrate hindu festivals. I have searched in Google about religion of gurung. And there are three types of gurung Hindu, Buddhist and the gurung religion. My parents think Buddhism and hinduism are same. So is this possible to follow mix religion. I mean is it common in Nepal. Because in India there is no mix religion. Fellow gurungs do you also follow mix religion? Thank you in advance for answering my query 🙏..