Acts 17:2 . . . "and . . . reasoned with them out of the scriptures,
Acts 17:11 "and searched the scriptures daily, whether those things were so."
Here we see that Paul, Christians(whether converted or not), were confirming Christs existence or not based on searching the scriptures . . . not through pointing out historical evidence. These two 'scriptures' have Jesus Christ being derived out of scripture . . . or, he's being made up out of midrash.