I'm not ignorant of Christian doctrine; just which particular variety he happens to ascribe to. Because there are many, many different denominations out there; and even those under the umbrella of the Church itself can hold different beliefs from each other.
As for me being adversarial; that's the point. I disagree with what he's saying, and I'm pointing out what I consider to be holes in his logic.
Except many Christians would disagree with you. Remember; yours is not a unified religion, where everyone believes the same things. Some would consider the idea the Jesus is God himself to be blasphemous; though I'm sure you would contend that it is them who are blasphemers, and not "true believers", like yourself.
You're really just digging yourself in further here.
There are many doctrinal conflicts about many different things, but the existence of the Trinity is not one of them. I'm sure there's tiny cults somewhere that don't believe in it, but Catholics, Orthodox, Coptics, Anglicans, Lutherans, Methodists, Baptists, etc, etc, all agree on the existence of the trinity.
As well as basically every single core doctrinal issue,
except the authority of the church/clergy, and that disagreement is pretty much just with the Catholics.
Doctrinal disagreements among Christians, in general, are over things like immersion vs sprinkling baptism, whether or not women should join the clergy, what elements should be part of a church service/mass, etc, etc. I suppose there is the Calvinism/non-Calvinism split, which is pretty serious, but that's not actually along denominational lines.
Now, if you consider Mormons or Jehovah's Witness' to be 'christian' then you could say there's major doctrinal clash, but I don't think Mormons generally call themselves christian, and Jehova's Witnesses don't, last I checked, so yeah.