You are headed down a very tough road. Some creationists will go ATM and throw all kinds of wrenches into your "scientific" arguments.

One of my favorites is that Carbon dating is all wrong, and also circular reasoning for the age of Dinos and the layers they were found in. (They say that both work off each other.... This dino is this old because it was found in this layer, but they say that the layer is that old because they found this fossil in it.)