You have no evidence outside of the bible that Jesus Christ existed.
None.
Actually, there are many, many texts and manuscripts outside of the Bible and even antiquities such as clay chards and further, even other faiths that recognize that Jesus physically existed. Muslims, for example, historically acknowledge Him as a prophet but not the Son of God.
Reason and faith can coexist, in fact, they must.
We could ask questions like this all day long… How do we really know George Washington existed?
If you want to approach this from your angle, we could say that everything that exists about him- pictures, documents, letters, historical accounts, etc… were made up. Even the bones in his supposed grave aren’t really his… just some pauper. Unless we have the physical proof i.e. “I have to see him”, he didn’t exist.
Jesus really did live, it is historically documented by friends and foes alike, his tomb was found empty (first discovered by women, of all people, who did not have the legal authority to testify in court- if they wanted to deny the empty tomb, they would have used men as first eye-witnesses)
I understand the “I need proof” reasoning, but it has no logical ending because then anything in history can become impossible to prove without personally witnessing the event. Besides, history is always written from the subjective point of view of the writer, who has his or her own presuppositions. BUT, if enough sources report the same thing, we can generally know it happened. There are 4 individual Gospel accounts, by the way.
This is why, it takes a leap of faith. And faith, cannot be materially proven or disproven.