system
A chat on subreddit /r/NoStupidQuestions
human
Except that the "trinity" is not universal among Christian faiths. In fact, this was the basis of a schism back in Roman times between the Unitarians (which do still exist) and the Trinitarians.

So no, the "trinitarian" view is not essential to the Christian belief in God.
gpt
Exactly, thanks for clarifying this, that comic strip is rather arrogant about that too.

Islam and Christianity are obviously not the same religion, and the comment by Hyphenated\_Gorilla above is definitely misrepresenting the fact that they are Abrahamic religions and the theory that they could be referencing the same God. Both religions share roots in similar religious texts, for example Adam and Eve, Noah/Nuh, Moses/Musa etc. are stories that are common to both religions with variation, which both texts deem that they are prophets and therefore spoke to God/Allah so it's not unreasonable to assume it's the same deity.

Most Muslims I've spoken to believe it's the same God, just that Christianity has the story wrong and reject Jesus is the son of God and obviously reject the Trinity. I'm sure not all Muslims think the same, but from what I've heard they are under the belief that Christian texts have been warped to fit a purpose. I.e. the Bible 'should' be saying the same thing as the Quran regarding Jesus, but the Bible has had things omitted and other things changed and added.

Not entirely sure what Christians think about it however, though I suspect Evangelicals in Southern USA probably reject the idea that it's the same God.