Earlier quoted context omitted.
"Tell people there's an invisible man in the sky who created the universe, and the vast majority will believe you. Tell them the paint is wet, and they have to touch it to be sure."
That's simply not true, evangelization is hard and requires connection to personal experience much more the convincing people of wet paint does, and it requires connecting it to personal experience for which people haven’t already accepted a better explanation, which is a lot harder than with “the paint is wet”. You don't just tell people “God exists” and they're like “Oh, sure, thanks.” (Well, except perhaps sarcast…
The belief in "invisible men in the sky" is older than human civilization. Even getting an atheist to convert to a religion is just a matter of convincing them about a bunch of details about a particular invisible man in the sky, and that they should pay attention to them. The majority of the work - convincing them that the very idea of an invisible man in the sky is something one can believe in - was already done by that person's family, all of whom had it done to them by their families, all the way back to neolithic.