I remember reading an interesting note of a priest having difficulty trying to convince incarcerated people to join Christianity because they were being outcompeted by Islam due to the fact that the Bible was wildly inconsistent with its messaging unlike the Quran which was a straightforward book of rules.
He went on to talk about how prisoners were always initially interested to learn that the Bible contained explicit material, but would ultimately find the Quran more useful because it just repeated itself about what and what not to do.