Julius Caesar lived long before Jesus.
Outside of the emperors, there's little attestation that anybody at all existed in those days. When it comes to the coins, not every emperor (particularly in later years in the Western Empire) got his face on one, and even some of the emperors on coins may be spurious.
They just didn't keep records in the old days like we do today.
Turns out Jesus' existence is attested to by the four major Gospel writers, as well as by others whose witness is included in those Gospels, or in letters by Peter and Paul that refer to the testimony of others.
During that period of time not another ordinary individual in Palestine has left behind any records at all beyond little carvings on graves.
I hope you understand that I raise these schizoid denials as a reductio absurdum of OBB's apparent assumption that the Person who has formed human history was invented by the Gospel writers. Eleven out of twelve of the Apostles died in agony attesting for the truth of the Gospels. If Jesus never existed then one of the many questions one would have to ask - why would they make this stuff up?