Isn't that Iran's idea too? Actually, the only way to bring people together is to eliminate religions first. As long as my god is real and yours is false, and your ancestors killed his son, we will never be in peace. There will always be a reason to fight and it will be brought up every time our leaders decide we need to kill each other so their corporations can make a dollar or two. See, Reaper90 was right about what he said about the average people. However, those attributes apply to our leaders also. They are in it for them selves too.
^ THIS
There is no way you'll even convince people who are on the religeous fringes to give up 4 or 5 thousand years of their culture and beliefs in the name of "global unification."
"So that some dude in 50 years can live on the moon I have to give up spiritual salvation?" LOL You're more likely to sell snow to Eskimos.
And as much as I despise the Imperial Federal Government of the United States of Amerika, I trust it INFINITELY more than the United Nations, the poster child for corruption, greed, ineffectiveness and waste. The UN makes the Gambino Family look like the Better Business Bureau.
I'll second the notion that everybody leaves everybody else alone, until such time that someone does something to deliberately hurt us or our well-being, or generally acts in a manner that cannot be tolerated (that whole genocide thing). Then it's "game on."