Tacitus and Josephus did not affirm non existent Jesus Christ

Flavius Josephus (A.D. 37 – c. 100) was a Jewish ... Josephus himself grew up in and around Jerusalem; he claims to have been a part of the Pharisaic group. But he was also obviously from a fairly prominent family. He's very important because he lived through and was actually part of the first revolt against Rome

The Roman historian and senator Tacitus referred to Christ, his execution by Pontius Pilate, and the existence of early Christians in Rome in his final work, Annals (written ca. AD 116), book 15, chapter 44