Consider some writing contemporary to Rockefeller (there is a section on cards): https://baptisthistoryhomepage.com/social.amusements.willis....
Consider that Titan was written maybe 100 years removed from the events and you're reading a secondhand telling of it from a blog. Maybe there is more context in the book if you're really curious, or maybe the context was lost from Rockefeller's time to the book, or from the book to the blogpost.
Consider a few more things: If you ask 10 Baptists about something secondary to scripture like this, you may get different answers from different people, especially if they are from different eras, as religion changes over time. As another example, some Catholics grew up hearing the mass in Latin.
It's funny though, Rockefeller appeared devout enough to understand that gambling was a sin. Rockefeller appeared to believe in an omniscient God. Did he really think his square counters would fool said omniscient God? People trying to find such loopholes in Religion is always fascinating to me. Of course, it could have all been a show.
> Did he really think his square counters would fool said omniscient God?
My favorite example of this is the string of fishing line around Manhattan.
https://www.npr.org/2019/05/13/721551785/a-fishing-line-enci...
The difference is that it is an explicit belief of most jewish groups that God put these "clever" gimmicks into the rules on purpose, God wants you to look for them and be rewarded for looking for them, and God thinks the way jewish people debate about rules is awesome, and that "clever" workarounds are just the best.
Contrast this with my Catholic tradition which insists that if I get cheeky with God I should expect to be slapped back down. Jesus seems nifty though, so it's a tradeoff.
Also, I'm lying. Catholics had no problems playing dumb games with "The rules" to eat beavers when they weren't supposed to eat "meat" and also fish aren't "meat" to this day. We're fun like that.