We are the most intelligent species on the planet, yet humanity has had a terrible track record with the other species that call this world home. We've destroyed habitats and hunted races into extinction. So just because a race is any of those thing doesn't necessarily mean it would care. A more advanced race could look at us and think we're not worth their time.
Of course that doesn't mean another race wouldn't care, it just doesn't mean they automatically would. But it seems incredibly unlikely that anything would care about the lives of every person on the planet, certainy not to the pathollogical degree that 'god' apparently seems to.
No, you can't introduce god to a friend. The reasoning is something you touch on there. God seems very much like a mirror. A reflection of the person. If a person is kind and loving, their god will be too. If they're hateful, so will their idea of god will be too.
Now with people you're right, there's no guarantee that two of your friends will get on, but that wasn't the point I was making. Friend a would, physically, be the same friend a that you know. Same as friend b. they may not like each other, but you know they'd be the same people that you know, with no room for error. To put it another way. You can give someone a red ball and they can't percieve it as anything other than a red ball. They can't confuse it for a rubix cube, or a hat or a ship in a bottle. It's simply a red ball.
Now try and show someone god and they won't see it the same as you. They see what they want.
The problem with that is, in my experience, god doesn't seem to mature anything. Quite the opposite in fact. God seems to have a tendancy to stunt wisdom, to keep immature prejudices, to maintain hate and inequality.