There was belief systems or religions earlyer that did practice blood sacrefices yes, One of them is the Odinic Religion, if its accurate to call that a religion. But one that was cenetered around the historical entity of Odin or Wodin. There is very little easily optainable information about the details og him. But he was from what writing Ive come across; a individual that did walk the earth that was a greate warrior with magical abilitys to open the earth to get to minerals, and control the weather and waves of the sea and to manipulate aspects of nature. And to his friends (folloers if you will) he did teach various magics of natural forces and apparently "teleporation".

So this is a religion based on what people learned form him and that they still got some suport in rituals after he was gone. Among them was sacrefice. Some of this is mentioned a little about in a book called Snorre: Myth/storys of kings - or the Norweagan title: Snorres Konge Soger. The form og magic described in the book is called; Seid.

This was the religion among the wikings of Europe and Russia (Svitjod) before Christianity was forced upon the people over time.

To note though; The information in this book is what the Islandic Noble considdered noteworthy, that wrote this book: Snorre Sturlason.