The biggest problems in the world are invisible

The spiritual is primary, and includes the material. 

Therefore every material problem necessarily has a spiritual dimension. 

But mainstream modern materialism denies the reality of the spiritual - and insofar as the spiritual is acknowledged (e.g. by churches) it is secondary to the material.

(e.g. Churches attitude to the Birdemic and lockdowns of 2020.) 

Consequently, the modern world is plagued by invisible spiritual problem - problems that are not and cannot be acknowledged as existing. 

For instance, our wars and rumours of war have primarily spiritual causes and motivations; but these true causes are undetected, never considered - excluded as unreal. 

Indeed; all of the most severe and intractable problems in the world are these invisible spiritual problems; because it is their invisibility that has enabled them grow to become severe and intractable.