I'm pretty sure that "returning to the root Slavic religion" would involve offering massive cow sacrifices to the thunder god Perun in exchange for long life and prosperity. Not sure if that's what you had in mind, though!
In most Slavic countries, it is customary to slay and eat a pig on certain holidays, like Christmas and our Slava.
In the US you kill turkeys for Thanksgiving. How different is that compared to other "sacrifices"?
Perun is a "pseudo" God, as much as Zeus was a pseudo God.
And if they are pseudo gods, then Jesus Christ is a pseudo God, too.
Gods exist as long as people believe in them.