One idea is a universal wisdom book based on cultures that existed before Christianity or Rabbinical Judaism.
Another is a dating book, for either men or women where I discuss the reasons some people get more advantages than others in attracting and keeping good dates.
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1Opinion
Ancient wisdom is a nobrainer in this one. You always looked to that stuff for inspiration even the many years on this site looking to god to obtain a lover.
I don't see you as the modern dating kinda type when your focus has always been in religion and that isn't what a modern dating kinda reader will vibe with. But a biblical study in a book or the ancient wisdom kinda angle fits what you usually talk about and where your real interests seem to be.