You are not wrong, there are lots of similar things in all the Old- European people’s mythologies.
I, presonally, think that might do bad to your ancestors and orgins. But that is nothing to prevent you from accepting it. You could actually spend some time researching your own history and beliefs and then “settle” for a organised religion. That is just a idea from me, because the same happened with me. I almost rushed into accepting a foreign religion which didnt suit me that much, even before researching my own, wich I found that suits me PERFECTLY. :)
If you find yourself and like Rodnovery that much, there is nothing keeping you from it. No one ever said “Only Slavs can be Rodnovers”, and even if someone did, it is not their own to judge that. Rodnovery is a belief in the Gods based of the old Slavs, it protects nature and honours ancestors and most importantly: YOURSELF. If you want to be a Rodnover and you’re not a Slav, there is nothing keeping you from it, you have all right to chose your belief, no matter what others might say.
So good luck and let me know ;)