There are clearly good reasons to doubt Jesus of Nazareth existence.

The first problem we encounter when trying to discover more about a man called Jesus of Nazareth is the lack of early sources. The earliest sources only reference to clearly fictional Christ of Faith. These early sources, compiled decades after the alleged events, all stem from Christian authors eager to promote Christianity – which gives us reason to question them. The authors of the Gospels fail to name themselves, describe their qualifications, or show any criticism with their foundational sources – which they also fail to identify. Filled with mythical and non-historical information, and heavily edited over time, the Gospels certainly should not convince critics to trust even the more mundane claims made therein.
Paul’s Epistles, written earlier than the Gospels, give us no reason to dogmatically declare Jesus must have existed. Avoiding Jesus’ earthly events and teachings, even when the latter could have bolstered his own claims, Paul only describes his “Heavenly Jesus.” Even when discussing what appear to be the resurrection and the last supper, his only stated sources are his direct revelations from the "Lord" and his indirect revelations from the Hebrew Bible. In fact, Paul actually rules out human sources (see Galatians 1:11-12).
There are no existing eyewitness or contemporary accounts of Jesus. All we have are later descriptions of Jesus’ life events by non-eyewitnesses, most of whom are obviously biased. Little can be gleaned from the few non-Biblical and non-Christian sources, with only Roman scholar Josephus and historian Tacitus having any reasonable claim to be writing about Jesus within 100 years of his life. And even those sparse accounts are shrouded in controversy, with disagreements over what parts have obviously been changed by Christian scribes (the manuscripts were preserved by Christians), the fact that both these authors were born after Jesus died (they would thus have probably received this information from Christians), and the oddity that centuries go by before Christian apologists start referencing them.
So what do the mainstream (and non-Christian) scholars say about all this? Surprisingly very little – of substance anyway. Only Bart Ehrman and Maurice Casey have thoroughly attempted to prove Jesus’ historical existence in recent times. Their most decisive point? The Gospels can generally be trusted – after we ignore the many, many bits that are untrustworthy – because of the hypothetical (i.e. non-existent) sources behind them. Who produced these hypothetical sources? When? What did they say? Were they reliable? Were they intended to be accurate historical portrayals, enlightening allegories, or entertaining fictions?
Ehrman and Casey can’t tell you – and neither can any New Testament scholar. In sum, there are clearly good reasons to doubt Jesus’ historical existence – if not to think it outright improbable.

Yes

Yes I will

Good

Yep

Yaaaasss

Wysiwyg

Hisbah6:
Wysiwyg

Yaaaay

Yes Lord

Yess

Glory.