Modern day people who believe there was no real historical preacher, probably named Yeshua or something like that, wandering around Palestine in the first century, and on whom the Gospels are based, are crackpots. Their position is strongly refuted by the available evidence. You don't have to be a theist or a Christian to accept this. See, for example, pretty much any of the works of Bart Ehrman, particularly "Did Jesus Exist?"

There are legitimate disputes about this historical figure. How educated was he? Was he more Jewish or Greek in terms of philosophy and theology? (That he was racially Jewish is undenied.) Was he a Zealot? etc. However that he existed has been very well established.