Do christians know who Jesus is?

It really depends on your faith. For example, baptists have different beliefs than catholics have different beliefs than protestants, etc. There are different versions of the bible that attest to that. There was a whole truth back when it actually happened but in the 2000 some years since all this happened, the truth surely has been translated differently through languages and stories and doentation. There is nothing that dates back that far in history that doesn't have multiple perspectives. For example, let's say that a guy and a girl got into a fight. They are both going to have different stories of what happened. It's only natural and isn't expected to be exact. The main point is that for christians, Jesus was the only son of God and that he was a good man. He died on the cross, and rose again three days later. The specifics aren't necessarily important, it's the whole picture that is.