Right, I’m not trying to indirectly make a point about Christ not being likely to have existed or anything, just making a point about the language: Christ’s existence hasn’t been scientifically proven, it’s just that historians agree that it’s a reasonable guess based on the texts that were left behind and mentioned him.
Archaeologists might use scientific methodologies, e.g. carbon dating, to estimate how old a text is, for example, but I wouldn’t consider this scientific proof that someone existed.