Wow... Just wow. The lack of knowledge in that statement is breathtaking.

The metal traders and other businessmen in ancient Mesopotamia (2000+ years before your fruit) absolutely knew "math better than counting on their fingers".

Usury restrictions may have had a lot to do with the social cost of loans among tight knit groups (such as, don't loan money to your cousin, it'll cause problems) or because they were rejecting "normal" behavior from a society they wanted to distance themselves from.

Also, the fruit was an allegory, like most ancient mythical stories. Even if you reject mythology outright, try not to belittle the moral and traditional bases for religions that billions of people on Earth follow. You aren't better than them for it.