Show us the commercially successful wonderfull code you wrote using functional programming and you will be 1000x more convincing than anything you claim in an article or religious face-to-face debate.

For example, there are hundreds of glowing articles written about Lisp, making all kinds of amazing claims about the superiority of the language and the superior intelligent of people using it. However very little commercially successful software is written in Lisp. Making those claims laughable and not convincing at all.

Less talking more walking!