There are plenty of extra-biblical references to Jesus as being a historical person who actually existed (and therefore not just a legend or a mystical vision or some such).
- Mara bar Sarapion (who lived sometime between AD 73 and the 3rd c.) mentions "the king of the Jews" in speaking of VIP deaths like Socrates and Pythagorus, which could believably be a reference to Jesus.
- Thallus, a historian of Samaritan birth, writing in about AD 50, writes in his 3rd book of his histories of Christ dying during a Paschal full moon. (The original of this writing does exist, but only a copy written by Julius Africanus in about 221. Its authenticity is debated.)
- Pliny the Younger (AD 61-ca. 112) writes about the persecution of Christians and that true Christians cannot be induced to curse Christ.
- The Babylonian Talmud (about AD 500) speaks of Jesus being hanged on Passover Eve.
- Lucian of Samosata (AD 125 - sometime after 180) alludes to Jesus as having been crucified in Palestine.
- Josephus (writing in the late 1st c.) mentions Jesus twice in his writings, once in Antiquities 18.33 and also in book 20.
- Suetonius, Roman historian, mentions a "Chrestus," which some take to be a reference to Jesus.
- The Egerton Papyrus (from AD 70-200) mentions Jesus.
- The James ossuary (mid-1st c.) mentions Jesus as the son of Joseph and brother of James. Its authenticity is debated.
- Tacitus, Roman historian, mentions a "Christus" as the founder of a group known as "Christians." (Annals X.44
- Ignatius of Antioch (AD 35-117) was a believer who mentions Jesus in his writings.
With all of these references, there is no reasonable doubt that Jesus existed as a man. There is no evidence from antiquity that the existence of Jesus was ever denied by those who opposed Christianity. It is also widely agreed as implausible that Christians invented him. Today nearly all historians, whether Christian or not, accept that Jesus existed. The claim that Jesus was simply made up can be debunked in many places. The total evidence is beyond a reasonable doubt.