What you're referring to is the "Jesus myth theory" - a disproven notion held by a few hysterics and nutcase anti-Christian bigots - which was a bogus idea put forth by those who were using the logical fallacy known as the "argument from ignorance":
All credible historians admit Jesus lived. The "Jesus myth theory" has been thoroughly debunked and only a few fringe zone looney tune bigots are still regurgitating that nonsense.
Since the advent of the Internet, there has been a concerted effort in some circles to revive this nonsense, but the promulgators of this now debunked notion have had to completely ignore academia and they instead established fringe zone websites to spread this lie.
Literally the only people who cling to this disproven notion are nut job anti-theist kooks who would love to foist off their wishful thinking as established fact while entirely disregarding documented history - history that is proven beyond any doubt to the complete satisfaction of professional historians.
Some sincere but nonetheless uneducated people do believe this notion, but they have been utterly brainwashed by history deniers and propaganda writers - and those writers have consistently failed to produce anything other than the same regurgitated nonsense that was proven false decades ago.
By the way, the notorious murderer and atheist Joseph Stalin was a firm believer in the "Jesus myth theory" - how convenient.
"Jesus myth theory" aka "Christ myth theory":
"Despite this there remains a strong consensus in historical-critical biblical scholarship that a historical Jesus did live in 1st-century Roman Palestine ... There are two events whose historicity receives "almost universal assent": that Jesus was baptized by John the Baptist and was crucified under the Roman Prefect Pontius Pilate."
"While historical and theological debates remain about the actions and significance of this figure, his fame as a teacher, and his crucifixion under the Roman prefect Pontius Pilate, may be described as historically certain."
Case closed - though nut case hysterics and other uneducated people will no doubt continue to whine to the contrary.
So you're absolutely right - the academic consensus is that the man generally referred to as
Jesus Christ did, in fact, live in 1st-century Roman Palestine.
Atheists always like to cite academia, EXCEPT when it disproves their nonsense. THEN they claim to "know more" than professional historians. It's called confirmation bias.
Case closed - though nut case hysterics, kooky anti-theistic lunatics and other uneducated people will no doubt continue to whine to the contrary.