Do atheists believe in time travel?

A religious man said that time travel is impossible because you could go back in time and kill Christ. However, I wonder what do atheists think. Well, many say that 'the book' says time travel is impossible. OK, in their case, the book is not the bible, but science. Their god is a computer making numerical calculations. Instead of worshiping a spirit being they put their faith in wires, circuit boards, and bits of metal. It reminds me of ancient people who bow down to a rock they carve with their own hands.