There is a near universal majority of scholars in many fields—historians, Bible scholars, New Testament scholars, philologists, archaeologists, anthropologists, literature, folklore and oral history specialists, paleographers, linguistics scholars in Hebrew, Aramaic, Greek, those in the field of the Classics, a Dead Sea scroll specialist or two, and many others—from atheist to Jew to liberal to fundamentalist Christian, who all agree Jesus existed.
Over the last two hundred years, there has also been a small group called “mythicists” who have asserted there was no historical Jesus. Richard Carrier is a mythicist.
Bart Ehrmann is an "agnostic leaning atheist" New Testament scholar. He is not a Christian.
Here is his critique of Richard Carrier. It's worth a read.