I don’t like it… it looks as if it was built in 9th century.

I think if they aim to “revive” Slavic faith they have to modernise it, make it acceptable and visually pleasing to a modern man.

This on example is Icelandic “Asatru” Church “Hallgrimskirkja”: 

They combined old religion with its motifs on more modern architecture. 

With the “authentic” approach they will just make it look like a museum, not something that people can adapt and relate to. They have to make it mainstream if they want to make it succeed, or else it’s always gonna look like just some plain weirdos cult dancing around a phallus tree idol aside from a barn.