Before I attack someone's beliefs I always ask myself what do I have to replace it with? Do I have something better for them? If they are in a destructive cult then the answer is definitely yes, freedom to be an individual who lives their life making their own decisions and is not subject to abusive teachings or tactics. But if it is say a person in some vanilla non-invasive faith, or perhaps they say they are just spiritual, then I don't want to mess with that if they find comfort in it and it makes their life better because I don't have anything better to offer them. Hammering them into believing their is no God, or higher power, or benevolent aliens, what good does that do? Have I improved their life by stripping them of these beliefs? Unless those beliefs were destructive, and I don't find belief in God to be inherently destructive, then I don't think trying to convince a person God doesn't exist serves any purpose.