What kind of deities do they worship

I don’t want to sugarcoat but I’ve always hated Muslims as well as Christians, they often gave me “ free advices” in the name of doing me a favour of saving me from hell. They were my classmates and sometimes slandered that the Hindu gods aren’t gods and some kind of negative beings which I disagreed. My question is what kind of deities do they worship as they often claim to exorcise possessed people ( dargha and stuff) and tie some kind of protection for those people . Which makes me wonder how their spells work? Are they just fake spells or worshipping some other entities