OP's interaction sounds almost word for word like a Bill Hicks routine (Which I can't link due to language, but it's the one on...well, dinosaurs).
"Dinosaur fossils? God put those there to test our faith."
"Dude, I think God put you here to test my faith."
"Dinosaur fossils? God put those there to test our faith."
"Dude, I think God put you here to test my faith."

As far as I know, the Biblical account of creation starts with an already existing Earth does it not... so the Earth/universe could already have been millions of years old at the beginning of Genesis.
Dis-believing them is not a mainstream theory as far as I know...
