Whatever people think about the trin, the purpose of the anti trins is to deny that Christ is God and that IS essential to salvation, now God is wonderfully merciful someone may be saved without knowledge [doctrinally] but they will never be saved without the fact....that Christ is indeed God mighty to save.
Of course once you admit that Christ is God it immediately is apparent that He is not the Father nor yet the Holy Ghost so you have to admit the plurality Persons in God's being.
Or, one can just go with what the Bible states instead of hanging on a pagan ideology.
See, the problem is not if it is wrong or not- it is wrong. I have proven it wrong both to myself and any listener who is actually man enough to admit it. Which isn't many, because trinitarians are dishonest. It takes that degree of dishonesty and denial to keep it alive. If everyone was honest, it would be a dead doctrine.
But because trinitarianism is so gigantic, one can feel snug inside of of that lie. They don't have to feel like blasphemers and idolaters because they have a billion other people to tell them a LIE that they are not.
That's perhaps why trinitarians so often resemble pagans right at face value. They know it is lacking deep down, so they compensate for it by acting high and mighty, being an embarrassment to both real Christians and to all of humankind in general. Fanaticism does not equal Godly, it equals medicine and asylum.
And this is precisely why idols are bad. The Bible speaks on this. What good has the trinity done? It has done absolutely nothing then divide Christendom and cause persecution.
Meaningless knowledge that does no good.
That is why I am being quite literal when I say that it is an unholy doctrine. It is obvious.