If it's known you are an atheist and your family isn't giving you the hard sell (or conducting middle of the night exorcisms), I suggest sucking it up and not engaging in arguments out of respect for them. When your mom tells you she talks to Jesus, smile at her and say, "I know you do, Mom." Then leave it at that. You'll be out on your own soon enough, and you have the rest of your life (as well as your time here) to argue about religion if you want.
My two cents.
My two cents.