Their minds are made up, and not because they have credible evidence that God does not exist. Their minds are made up because they're reprobate. They've made a choice to reject God in favor of some humanistic and immoral lifestyle. That's why these conversations never go anywhere.
There's tons of evidence that God is real. (Even saying that sounds idiotic. That's about like the cake I just baked insisted I'm not there.) The teleological argument. The cosmological argument. The ontological argument. Etc.
But the atheist simply isn't interested.
Rom 1:22 Professing themselves to be wise, they became fools,
Rom 1:22 Professing themselves to be wise, they became fools,
Indeed. Good point on monologue. One only has to turn on the boob tube to see this (Bill Maher)