I'm not here to argue god today. But this ad is ridiculous any way I look at it. Either the writer lacks the belly, to state that there is no god; or they are resting their whole life on a flimsy sort of probability. (OR they could simply be being manipulative.) And they are urging you to join them!
It's like anarchists. Do these people really imagine that they are so special, so crafty, so cruel and so strong that they would not get instantly brutalized, in an anarchist world, by the stronger and meaner people we know to exist?? Get real!!