I think it comes down to fear and irrationality. The more deeply religious the less critical thinking skills the individual possesses. Exactly why there are many different religions and differing levels within each religion.
The fundies are the worst as no amount of evidence will ever convince them they are wrong. I imagine that many people are religious due to disingenuousness. They know they are wrong but are willing to ignore it for the infinitesimal chance in their mind that there is a hellfire they could burn in for eternity though we know the impossibility of that for various reasons.
These are simply my conclusions after pondering your question. I'm fairly new to this religion thing so I'm sure there's more to it than what I've outlined and others can add them if they wish.
The fundies are the worst as no amount of evidence will ever convince them they are wrong. I imagine that many people are religious due to disingenuousness. They know they are wrong but are willing to ignore it for the infinitesimal chance in their mind that there is a hellfire they could burn in for eternity though we know the impossibility of that for various reasons.
These are simply my conclusions after pondering your question. I'm fairly new to this religion thing so I'm sure there's more to it than what I've outlined and others can add them if they wish.
Theists changing my derision of religion is equivilent to pissing into the wind and expecting not to get wet.