I think to claim that 2000 years ago there was one person who performed miracles and/or healed people that nobody else could, with no actual evidence it was done and nobody else has been able to do it since, you need a better response to someone questioning it than “oh were you there? prove it didn’t happen.”
even the Jews of the time that did not believe or follow Jesus wrote that he performed signs. They claimed it was sorcery.
in Folio 43a of Tractate Sanhedrin of the Babylonian Talmud as follows:
‘It is taught: On the eve of Passover they hung Yeshu and the crier went forth for forty days beforehand declaring that "[Yeshu] is going to be stoned for practicing witchcraft, for enticing and leading Israel astray.”’
The relevant portions of the Bible record that the Jews of the Sanhedrin acknowledged the signs and miracles but said it was by the power of Satan that he did these things.