You must be aware that most men (and also not only a few women) are by nature not monogamous. This nature makes itself even more forceful when tradition and circumstance stand in an individual's way.
Money was established for exchange, but interest causes it to be reproduced by itself. Therefore this way of earning money is greatly in conflict with the natural law.
The average businessman began to be agnostic, not so much because he did not know where he was, as because he wanted to forget. Many of the rich took to scepticism exactly as the poor took to drink; because it was a way out.
Pseudo faith always arranges a way out to serve in case God fails it. Real faith knows only one way and gladly allows itself to be stripped of any second way or makeshift substitutes. For true faith, it is either God or total collapse.