Mohammed is not fully comparable. His life was on the outskirts of most of civilization meaning we should expect bad record keeping. Jesus was right in Jerusalem a major city in a major empire that documented stuff. We should expect that they would have records and that the records would have preserved since Christians controlled said records. Exactly what we do see. We have an abundance of records about the man from 2 centuries later. Nearly all Empire writings are missing from that time and yet Jesus is found repeatedly. If there were a letter talking about him or a court record or a particular landmark, and this guy really existed, we should have it. Which we don’t.
Where is the Kaaba of Jesus? Where is the tomb he was in? Where was he executed exactly? Where are all the relics of what he touched? History can’t say anymore than history can tell you the first time Batman threw a Batarang.
Now it is possible a man named Jesus son of Joseph existed in those years in that area. Just like it is possible someone named Bruce Wayne existed in NYC in 1939. That doesn’t mean this possible person was the minimum historical Jesus. That would still have to be demonstrated.