Jesus a real person?

I recently come a cross two greek writers accounts of Jesus and Christianity. Celsus' "True Doctrine" and Tacitus' "Annals". These writings are from the same time period (between the first and second century) as the books of the bible. The thing thats different about these is that they clearly have a disdain for Jesus and christianity. Celsus claims that jesus is the product of an affair with a Roman soldier and that Jesus ' miracles are Egyptian magic. Is this proof that Jesus was a real person and not just a mythical figure?

 

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