Is there any scientific proof that Jesus existed?
This type of question is what is known as scientism. Its the assumption that science can answer all forms of knowledge questions. It replicates the problem that Hume created with his fork and it replicates the problems of positivism which was mostly abandoned philosophically in the 1970s, because it was a dead end.
Its also a category mistake. The question of Jesus is a historical question, not a scientific one. If you want to look at the question of miracles, thats another question.
However, the existence of Jesus Christ like the existence of George Washington, Thomas Jefferson, Paul Revere, and even Barak Obama is a historical question, not a scientific one.
Science focuses on the repeatable and questions of biology, physics, and chemistry. The existence of Jesus isn’t any of those and is in fact a historical question.
Not to mention, this precedent of eliminating historical figures based on scientific proof would serve to eliminate all historical knowledge and figures. Aristotle, Plato, and the key historical figures I referenced earlier. And ultimately all of them.
William Lane Craig offers two answers to this question:
Some of the above quotes can be found here (along with some quotes by Ed Feser on the topic):