The way I’m thinking this is that all of the religious people in the world should be executed. Now I’m aware that there are a lot of religious people in the world - probably the majority. So if the population of the world is 6 billion I would estimate that about maybe 5 billion of them have some sort of religious belief.
So they would be the ones for the chop.
I’ve anticipated that there may be some problems with my strategy. For one thing - what about a remote tribe in say South America or Africa where everybody holds unquestioningly to shamanic or animalistic beliefs? I posit that in most of these tribes there will be one person who says “Hmm I dunno about all this stuff. We pray that we’ll kill a big animal today and some days we do and some days we don’t - just seems random to me”
Now he/she wouldn’t be an atheist according to strict western definitions but I would say - him, we allow to live. The rest of the tribe are executed.
Admittedly the population of the world would be thinned out dramatically. There would be far fewer people in the world, only 1 billion, but what a billion - quality not quantity. We can finally proceed without having to accede to the insane wishes of religious groups all the time.
I acknowledge that what I’m proposing is a fairly extreme measure and not without it’s difficulties but imagine what the world would be like after. We may still have political differences but at least the supernatural is out of the equation.