Atheist gives invocation at city council meeting

Awesome to see

Redefining invocation. An invocation is the act of seeking guidance from an higher power. Who goes an atheist seek guidance from? The only reason this speech was made was to disrupt traditional religious invocations in order to make a political point and bring attention to oneself.
Exactly how significant of a population are atheist and non-believers? How does one prove it? As a Roman Catholic, I register with a parish. Is there a standardize test or a qualification process to be an official atheist? Pew Research documents 3.1% of Americans are atheist. Gallop polled 10% don't believe in God. Oxford Handbook claims 8% of Americans are non-believers. Problem of these stats is that they are subjective and not based in standards or long term rigid supportable behavior.

I guess that there's nothing wrong with it, but why?
Seems a very odd choice.