r/TrueProtestants

I should probably ask them themselves but I really don’t want to get apologetic responses.
From what I can tell EO treats the filioque like it’s on par with the unforgivable sin- if you don’t agree with their stance it’s an automatic ticket to hell.
And I don’t get it. Most obviously Jesus never says you need to have a perfect understanding of how the trinity works to be saved.
But I think more importantly, it’s impossible to understand the nature of the trinity and the Holy Spirit. So why are we splitting churches and dooming other Christian to hell over an issue that has no effect on salvation(according to the Bible) and is impossible to come to an answer to anyways?