"Why would church invent a new language and taught christianity to pagans in it, if nobody could understand this language? It doesn't make sense. Cyril and Methody used language of Slavs because Slavs could understand their teaching in it."
The "sense" about this 'theory' is to cut, annihilate Slavic elements, roots of their people and to "confuse" their languages. The logic is not important. Important is the message within this propaganda and attempt of domination which is a water on a Mill of every "historian" or non historian from this side...
Regards to "vandalorum". He is representing one of those spineless molluscs, as their minister Radoslaw (probably a "balto-celtic" name i guess) Sikorski already described few days ago, giving a Blowjob... So this is his position. And I totally understand him, do not take my words personally. I would be afraid of Russia too if I would be living in Poland. But I think that those times of Stalin are gone...
I guess even their most pro western people have started to think about the dangers of the Drang nach Osten also... Half of current "Germany"(which was originally a geographical term) was until 11th century partially Slavic. All the famous cities like Berlin, Brandenburg, Muenchen, Dresden,... have had origins in Slavic languages. This was a 'thorn' in a heel of many Goths and Christian "holy men" in those times. The best solution was an invention of Christianity for Slavs via Cyril and Method. This is how they brought this "religion of peace" to 'primitive barbaric Slavs', with a Genocide and slow parasitism. Even Sweden was part of this project of de-Slovenization. But even Sweden did not "forget" all Slavic words until today, instead of the major silence... brsk – brž, besok – obisk, bunke – bunka, nabunkati, butt – butniti, butati, drag – dražiti, dromme(izg. Dreme) – dremati, dronne – drneti, drysse – trositi, gnata – gnati, gnida – gnida, grabba – grabiti, grunda – gruntati, gunga – gugati, hel – cel, hit – hitro, kopa(izg. Kupe) – kupiti, lank (izg. Lenk) – členk, mange – mnogi, mare – mora, mena – meniti, minne – spominjati se, mole – mujati se, mork – mrk, mračen, pigg – pik, pikati, rafsa – ravsati se, rappa – nadrapati, nabiti koga, sael – vesel, sen – pozen, skada – škoda, spoke – spaka, strašiti, stro – stresati, strype(izg. Strupe) – strup, tanja ut – stranjšati, tiga – tiše, tiho, tiske – tiše, šepetati, torg – trg, tycka(izg.tuhe) – tuhtati, udd – ud, okončina, vadra(izg.vedre) – vedriti, vard – vreden, varg – volk, vingaard(izg.vingord) – vinograd, hraki – hrakelj(izpljunek ob hrakanju), prast – prost, korug(izg.kruh) – kruh, mylnar – mlinar, mylna – mlin, drag – dračje, gass(izg.gos) – gos, kvas – kvas,kvašeno, raka – rak, jordgubbe – jagoda, redding – redič, kvar – kvar, bra – dobra, tarna(izg.trna) – srna, dropp – droptina, strack(izg.strok) – strok, mjod – med, ata,ete – jesti, kupa(izg.kipe) – kipeti, most – mošt, olje – olje, satt – sit, soppa – župa, skorpa – skorja, skinka(izg.šinka) – šunka, skum – skominati(cediti sline), slubre – srebati, slen(izg.slin) – slina, tjock(izg.čok) – čok, torr – trd,trdo, dyrka – dirka, hlaupa – hlapec, sula – sulica, radd(izg.rt) – rit, otta(izg.oča) – oče, dykke – dekle, frakka – frača, loka – lok, pridn – priden, val – voliti.
All words above are Swedish-Slovenian (Svenska & Slovenska) & I have not even touched any Russian or Polish yet... now imagine those pre "Russian "Vikings"(no, i am not talking about Swedish Vikings, Jarls) being in fact only Venetic (Slavic) Variags(which were not the Vikings) living in a city called Stargard ("old city"/ Grad (indeed; "Mitgard, Asgard = Mitgrad, Asgrad.. like "Stalingrad") in current Poland & Germany, who became rulers over Russian Veneti and moved their capital city Stargard to a new capital city called Novgorod (means "New Grad" or "new city")...
Language is a very powerful thing... If you destroy it, assimilate it, gives you a power over the whole (new) nation. In few 100 years there will exist Historians who will claim that "Poland was never a Slavic speaking territory", because they will already speak German and English with few Polish slavic "remains" which will be telling some different story about them...