Jesus likely existed. It’s easier to imagine the steps from an influential cleric to messiah-myth than an early church conspiracy to weave a savior whole cloth.
There is little evidence, but that’s exactly what you’d expect from a 2,000 year old narrative. What we know about emperors of the time is scant and largely mythical. If an accurate record of the life of an impoverished Rabbi from 1st Century were available, that’d be miraculous in itself.
Plus there is the textual argument that u/BrotherL0v3 makes.