There have been so many pieces of evidence. The most profound would have been archaeological evidences that
1) The Bible is wrong.
2) Evolution is right.
I cannot separate the two because (2) proves (1). I have walked through the museum and read the stories on the fossil finds on animals over the billions of years and homo sapiens and their ancestors over the milleniums.
But even ignoring all that, archaeology has proven to my satisfaction that the exodus never happened, the flood never happened, the Hebrew kingdom was not what the Bible makes it out to be, other "gospels" existed and were suppressed.