The phenomenon is that there is really strong evidence FOR something and really strong evidence AGAINST something. They are incompatible. Yet according to Bayesian reasoning you are like an ass stuck between two bales. You can't make a rational choice as to which is RIGHT, so people wind up picking one based on other reasons.
If you also consider Pascal's wager then that increases the weight on one side. In short you are between two massively compelling pieces of incompatible evidence.