On Stormfront if you step out of line you will get banished 100%. Mention Satan positively in any way = message blocked and direct ban.
Stormfront type WN people couldn't care less about your "Shiva" being "Odin" being "Satan" or whatever. This would sound like 100% lunatic babbling to them. And totally irrelevant from their POV because this type of people care about the concrete and material situation of the white race and the gloomy future it seems to have, they don't care about spiritual theology on which ancient "primitive" myth was what etc. These people are very rooted in a way, they care about concrete information, concrete solutions that can visibly affect the material, etc.
There is also no such thing as "something everyone will agree with and that cannot be denied because its historical facts". That's not how the human mind works. If the unconscious is infected (by xtianity in this case) the conscious is set up for failure and won't be capable to process and internalize opposite arguments.
It might be useful to bring up Church of Creativity as a steppping stone to wake them up to the Yehuborim poison of xtianity (posing as church of creativity supporter or member or interested into) and down the road also post articles from other sources about nazi occultism and the nazis working to make contact with advanced beings, ancestors from others worlds, our ancestral Gods etc.
WN people tend to worship Hitler or at least admire him very strongly. Showing that he was not xtian and was opposed to it should help a lot. Bring out the quotes like crushing xtianity like a poisonous toad. Memes are good, use them. Don't mention he is alive or he ascended into Godhood etc. Remember don't be (seen as) a lunatic.