If one has a friend who's and atheist--someone who believes in evolution, big bang, etc--what methods can you use to convince him to abandon his old ways and start keeping some of the mitzvot?
Bible codes can be chalked up to coincidence. Proofs from the laws of the kashrut can be said to be generalized and not conclusively proven. Predictions prophesied can be retorted by saying that if you look for something in such a vast collection of texts anything could be found. If you try to suggest torah lectures for them to watch, they will say that they don't have an hour to listen to nonsense.
Granted atheism can be used as a device to rationalize not following the Torah or God, can any method in particular penetrate this particular mindset?