I would be interested in hearing what this contrary evidence involves.
Here is one quick one:
Biblical scholars place the flood at about 4,350 years ago. For deposits of that age you look to soils, not geological formations; bones, not fossils.
More precisely, you look for soil deposits that are about 4,350 years old. Fortunately, those are pretty much everywhere. Your backyard is a good place to find soils of that age.
And who deals with that time period? Archaeologists for the most part. (Me, for example. And thousands of my colleagues around the world.)
And what we have found in dealing with the general time period of 4,350 years ago is continuity--continuity of human cultures, fauna and flora, mtDNA, and sedimentation.
We would have none of those things if there was a global flood at that time period.
What we would have then would be erosional and depositional features. For examples of those, google "channeled scablands" and see what much smaller and much older floods leave behind.
So, don't bother telling me about Pangea, the Cambrian explosion, volcanic eruptions, or fossils. If you want to present evidence of a global flood, better make it in the proper time frame.
Religious belief does not constitute scientific evidence, nor does it convey scientific knowledge.