Are you reading because you're religious, or are you interested in it as literature or history or something?
The new testament is pretty clear that the tri-fold god described therein is *sharply* different than the one described in the old testament, regardless of how different Christian denominations interpret the reason for that, and importantly, that it definitely supercedes the older one. [1]
I may have already said that, but it's a never ending topic.
[1] many years ago I said "sect" instead of denomination in an online conversation with someone who thought they were fluent, but were unaware that one of the meanings of "sect" *is* an approximate synonym, but they thought it was one of the other meanings and I was calling Christianity an evil cult or something so they were super , super mad and refused to calm down.
Crazy person, but I try not to use that word as much ever since.