They already do....well the normal religious and atheist individuals. But I expect you are more referring to the nut jobs on both sides getting along. The answer is a resounding NO. The asshole religious folk and asshole atheists can't even successfully integrate into society or follow basic societal norms let alone deal with each other.
But if we walk in the light, as He is in the light, we have fellowship with one another, and the blood of Jesus, His Son, purifies us from all sin.
