They Have A Theory

Experts go back and forth on whether coffee is good for you.
We can't cure the common cold.
We don't know what causes MS.
For a long time it was believed with certainty and confidence that the sun revolved around the earth.  It was plain to see.
Our understanding of how the brain works has recently transformed.  The idea of the brain having "plasticity" was dismissed and resisted for years despite evidence to the contrary.  It is now accepted and believed.
They say the universe started with "big bang" but can't explain why.
That same intellectual capacity and vision tells us that God is not real.  Not to worry though, they have a theory.  That doesn't sound reasonable or credible to me.