In connection with this topic, I highly recommend the videos below.
First of all, it is necessary to clearly separate facts from myths. While Christians argue that Slavic spirituality was a polytheistic belief in multiple gods, a faith where wooden idols were worshipped, serious scientific facts say something else.
The truth is that the spirituality of the Slavs was very advanced; they did not believe in any idols, nor did they worship multiple gods, similar to the Roman and Greek religions. Most historians, ethnologists, and archaeologists share a similar view.
Everything indicates that the Slavs had a very similar system to that of the original South American tribal shamans – great respect for nature, they believed in a more abstract God – that is, not in a personal God limited only to primitive human ideas, they recognized the system of seven chakras, they worked a lot with energies, they placed great emphasis on the ability to leave the body – astral travel. What is astral travel – leaving the body more here
https://filozofia.nett.to/krestanstvo/en/what-is-shamanism
https://www.youtube.com/watch?v=6BXvtGMu_DY
A strong argument that the Slavs had the above-mentioned spiritual system is the testimony of a well-known traveler who confirmed that many indigenous cultures across the planet have a very similar spiritual system, and we can logically assume that the Slavs were no exception.
The Slavs did not sacrifice animals to the gods. This could have been a misinterpretation by the Greek historian Procopius, who confused the sacrifice of animals to the gods with the so-called appeasement ceremony when killing animals, which are completely opposite ceremonies. I write more about this at the following link.
https://filozofia.nett.to/krestanstvo/sk/krestanstvo-je-nechutny-zvrateny-demonicky-kult-krvi
Archaeological evidence that the Slavs had any idols is absolutely marginal and may also be a misinterpretation of archaeological findings.
The origin and spread of myths about the Slavs, that they were polytheistic primitives who worshipped idols
This is a demeaning propaganda of the church and Christianity – it is church propaganda to slander the spiritual system of the Slavs. Various modern Slavic pagans who are trying to return to Slavism have naively fallen for the church's propaganda and worship primitive cults of gods and idols.
There are records that even after 1900, near Minsk, pagans sacrificed animals to the Gods – even more than 117 years ago, people tried to reconstruct Slavic spirituality, but in the wrong way – only on the basis of church propaganda.
Articles about Perun
https://en.wikipedia.org/wiki/Perun
https://ru.wikipedia.org/wiki/%D0%9F%D0%B5%D1%80%D1%83%D0%BD
Other important links
Slavs and Indians and their relationship to the Absolute God. Religion is evil. https://www.youtube.com/watch?v=vgAigiccVaQ
The Old Slavs were not pagans. https://www.youtube.com/watch?v=gznH_lhHIik
Slavs and Indians and their relationship to the Absolute God. Religion is evil. https://www.youtube.com/watch?v=vgAigiccVaQ
About the Slavs. The Slavs also had a spiritual system of 7 chakras. Slavic esoteric comedians. People who profess to be Slavs should, instead of stupidity, promote the true essence of Slavic spirituality – working with chakras https://youtu.be/Rc94Nk4ijAk?t=53m31s