I try to avoid the argument with my religious family if I can because if somebody is unable or unwilling to have an open mind, anything you say to them falls on deaf ears. You can tell them all the proof in the world that their religion is most likely false and they'll never change their minds. I would just explain that you do not believe in gods and just believe in doing good in this life and that's enough for you (that's how I explain it anyway).
Cher
"I have no advice for anybody; except to, you know, be awake enough to see where you are at any given time, and how that is beautiful, and has poetry inside. Even places you hate" -Jeff Buckley
"I have no advice for anybody; except to, you know, be awake enough to see where you are at any given time, and how that is beautiful, and has poetry inside. Even places you hate" -Jeff Buckley