There seems to be some side issues that I do not want to delve into but 
this issue I want to address.

First, I do not believe you have to know the Trinity to be saved.  THat 
is clear in the Old Testament and most of us. 

Secondly, I do believe that you cannot be a Christian and deny the 
Trinity.  Why?  The trinity is God and God is the Trinity.  In other 
words, if you worship something that is not the Trinity, you are not 
worshiping or following the God of the bible, a clear violation of the 
2nd and 1st Commandments.  I can say that one can be ignorant and 
struggle with the doctrine.  Yet, denying the Trinity is, to use the 
word as it was meant to mean, heresy.

Traditionally, there are three things that must be in place for a person 
to not be an apostate. They must have a proper view of God, a proper 
view of Salvation, and a proper view of the Word of God.  One is who you 
worship.  If you worship another God you cannot be saved (the Trinity is 
God).  The second is the means of salvation.  The third is the source of 
revelation. 

DrD