Why is it that whenever I ask a theist to prove the 'incoherence' of atheism, all I hear is white noise?

The know no other way to think, they have been indoctrinated with this view of Theism Vs Atheism for a very long time. I cannot imagine a logical being believing in the fables in the Bible, so reasoning is never going to be easy. They have preconceptions because it re-affirms their faith.