Not to mention the how a lot of polytheistic gods (like the greek pantheon for instance) were made up of total crazy psychos, lol. And while, yeah, the gods could intervene on your behalf and you could make offerings to them, really what you wanted if you were smart was for the gods not to notice you and leave you the hell alone, because more often than not, their interference in your life made things worse. And people still worshiped them.

There's a difference though, because in a polytheistic pantheon, the gods are more powerful than you, but they're also demonstrably imperfect, and not omniscient--and they're present.

The Maker has turned his back on humanity. You can't pray to him, because he's not listening. You can't sacrifice to him, because he's not paying attention. You literally don't get anything out of worshipping him. Leliana is considered a fringe radical for suggesting that the Maker is present and loves his people.