There are litteral mountains of evidence. Go hike the Grand Canyon, and then have him do the math on how much sediment must be put down in how much time to account for what he sees.
Then realise that there are miles of the same stuff BELOW the bottom of the canyon, reachable via rock cores.
Such things can't be accounted for by "a flood". I just don't limit God to what He put in the Bible. There must have been many other "floods" that he just didn't put in there.
I grew up before these people started selling books with fake science to faithful people and getting them all stired up about creationism.
I was taught, at a church retreat, by a decon of the church, and who was also a science professor at the local college, that there is no contradiction between Genesis and evolution. Once you can read Genesis, and see the incredible correlation between the sequences of events in Genesis, and the sequence of events as described by science, then how can you believe that Genesis wasn't inpired by God?
There is no contradiction between Genesis and science, and the fact that this is so is actually something that faithful people should proudly proclaim.