The Outsider Test in Action: "Studying Islam Has Made Me An Atheist" by Douglas Murray

Gradually, scepticism of the claims made by one religion was joined by scepticism of all such claims. Incredulity that anybody thought an archangel dictated a book to Mohammed produced a strange contradiction. I found myself still clinging to belief in Christianity. I was trying to believe — though rarely arguing — ‘Well, your guy didn’t hear voices: but I know a man who did.’ This last, shortest and sharpest, phase pulled down the whole thing. In the end Mohammed made me an atheist.
...the idea that there is any book ‘wherein is no doubt’ is insulting as well demonstrably untrue.
HT Agnosis.