Of course most people believe Hitler and Stalin existed, even though there is less historical evidence for them than for Jesus. As a matter of fact, people are still arguing over the actual villain status of Hitler, because the case is complicated. Nonetheless, most people are able to accept on the basis of his historical impact, that Hitler existed, more or less in the form mainstream history represents him, and most people don't seriously doubt the *basic* content of Mein Campf even though there may be arguments over how it should be rendered into English.
Likewise, while there are many different opinions of Stalin, Constantine, Pontias Pilate, Alexander, Cleopatra, and Genghis Kahn, most people don't doubt their actual historical existance, because of the nature and size of their impact upon history.
Similarly, it is absurdly implausible to 'explain' Jesus as a merely a recycled 'sun-god' myth, (as posited by Medicine Woman) when his teachings and his impact upon his own opponents strongly suggest he was at least one of many historical Rabbis/messiahs known to have existed in the time period. Even the vehement opponents of Jesus and Christianity (the unbelieving Jews) never leveled such absurd claims against Christian apologists, because they were blatantly ridiculous. If such a case could be made in any way, it would have been made repeatedly by Jews for the first four centuries after Christ.
A careful and unbiased reading of Jesus' teaching (which is loaded with semitisms) will show less resemblance to ancient Egyptian myths, and reveal rather an uncannily close resemblance to Rabbinical teaching, thinking, and arguing, as found in the Targums of Qumran, the Midrashes of all ages, the Talmud (both Palestinian and Babylonian), and thousands of Rabbinical works ever since.
In other words, everything we know about Jesus says he was a Jew, not an Egyptian illusion, mirage, or hologram brought on by heat stroke. It is doubtful that thousands of hardcore Jews abandoned the faith of their fathers (which they were willing to suffer torture and die for) in order to embrace a vague nostalgic fantasy from the hated Egyptians.