Is there evidence of Jesus existence outside Bible?

I am having a serious debate with one of my lapsed sons that the new testament is just a mish mash of stories developed over centuries and that Jesus did not exist! He does however, believe in God

Another son has become an atheist and don’t waste his time trying to convert him.

The following links should help answer your questions. If you have any further questions, please contact Catholic Answers directly.

Recommended Reading:

Why should I believe in Jesus Christ?
How does the Church respond to arguments that Jesus never existed?
Is Jesus a myth?
Is there any historical evidence that Jesus existed?

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