Could atheist westerners, please explain?

[Pat Mustard]

Constable Dorfl

And here is why I asked the question. A secular post WW2 UN, which neglected religion and claimed to be non-religious, was the first to allow religious fanatics to create a caliphate with a religious symbol in the middle of its flag.

No numbnuts it didn't. It was a combination of initial US and UK support followed up by continuing money and guns being funnelled in by countries such as Saudi Arabia and the UAE which created this accurate image of islam in our midst. You cannot blame the powerless for the monsters the powerful themselves created.