If you want users just find the people who have the problem you're trying to solve.
That being said, I think it's obvious that I totally disagree with the author. You should run ads. Absolutely. If you get a paid customer right away, that in itself is a much stronger indicator than someone signing up for a freemium product. I find this article carefully crafted to to be somewhat controversial, perhaps on purpose so it reaches the front page of HN. Mission accomplished. Congrats!
I even created my profile on the same day and yet it was so well received. Got a lot of paying users as well. Maybe there are some people who try to game the system (just like there are people on HN too) but I wouldn't make them generalization since my experience has been very good on PH.
According to [1], many founders have taken on "advisers" with curator privileges, giving them a little bit of equity in return for the publicity.
Hacker News is nothing like that. Although your social group can help you promote things here, there's no startup adviser that I can give 0.5% ownership to in return for bypassing the voting queue.
[1] https://news.ycombinator.com/item?id=10739875
[2] https://www.recode.net/2015/6/18/11563670/product-hunt-the-s...
So it wouldn't be too hard depending on the purpose of the Bible (is it a study bible? or a new translation, what is the focus of this translation? etc). It could also be a gift for somebody else. I've gifted a good number of bibles, even ones I absolutely loved.
On the other hand, trying to sell bibles outside a synagogue is probably not going to get you a lot of success.
Thus buying users won't scale at first, but it's OK (even recommended) to do things that won't scale early on. http://paulgraham.com/ds.html
So go ahead and buy ads if it helps you get started, but if the ads aren't making a profit right away, think about how to find a path to growth that does scale.
But back to my point: there's nothing wrong with trying some Google or Facebook ads. Don't spend too much up front! Google will try to get you to broadly target a bunch of generic words. You should resist that pressure and use their keyword research tool to home in on specific phrases that your potential customers often search for.
Once you have your phrases, just put in $500 and see what happens. If you pick up a handful of customers who pay you $1000 over the next 6 months, then you're golden! Put in $5,000 next time and see if you can turn it into $10,000. Honestly, this kind of thing works for some businesses and people end up dumping as much as they can into ads. Don't ignore this strategy just because it's not as "sincere" or "personal" or something.
[Edit] Fixed author pronoun.