I would have to say that I wish Jesus existed, but I don't really believe that he did.
I have several reasons to not believe that he's not real.
1. In the temptation in the desert, Jesus used the phrase "It is written." If the written scriptures were so important to Jesus then why didn't he write anything himself? Theologians debate for hundreds of years on issues that Jesus could have settled by simply writing his own authoritative scripture, but he didn't.
2. I believe it's the Gospel of John that mentions that people rose from the dead and came into Jerusalem after the crucifixion. This would have been big news, but no writers of the period mention this event at all!
3. The earliest writers of the Church use scriptural references in their writings, but not one of them ever mentions anything that an apostle actually said to them, or what any apostle said to anyone else that isn't written in scripture. This seems strange since if the Jesus was real, and his apostles are real, then the early Church writers should have had real experiences to draw from that were outside of the scriptures.
4. Jesus's mythology seems to have borrowed from MIthraism, Judaism, Buhdism, and etc...
5. Christianity believes in only one life, and then judgement, but in the gospels, reincarnation is alluded to.