From the Talmud, a collection of Jewish rabbinical writings compiled between approximately A.D. 70-500. The most significant reference to Jesus states: On the eve of the Passover Yeshu was hanged. For forty days before the execution took place, a herald ... cried, "He is going forth to be stoned because he has practiced sorcery and enticed Israel to apostasy."
Lucian: of Samosata: a second century Greek satirist. In one of his works, he wrote of the early Christians as follows:
The Christians ... worship a man to this day – the distinguished personage who introduced their novel rites, and was crucified on that account.... [It] was impressed on them by their original lawgiver that they are all brothers, from the moment that they are converted
and deny the gods of Greece, and worship the crucified sage, and live after his laws.
Pliny: Evidence about Jesus and early Christianity can be found in the letters to Emperor Trajan. Pliny was the Roman governor of Bithynia in Asia Minor. In one of his letters, dated around A.D. 112, he asks Trajan's advice about the appropriate way to deal with the growing Christian problem...
Later with Pliny and noting this information: "After the death of James, 61–62 C.E., Symeon, son of Clopas and cousin to Jesus, became the next episcipus, or bishop, of Jerusalem. And, according to Eusebius, the early Jerusalem church continued to exercise ...more here...
https://www.christianhistoryinstitute.org/study/module/pliny/
Of course the New Testament account as a legitimate written and oral tradition would be accepted in any court of law today as evidence of Jesus Christ. Ultimately though it is a matter of faith as is most of the issues we accept as truth.