This issue is that he Vought believes billions of  persons are of unequal value in the eye's of a God.   

Sanders question, and it is perfectly valid, is if that attitude should disqualify Vought from a leadership position.
I'm a Christian who does not believe in hell.    I have every right to work in a Federal position without regard to the particulars of my religious beliefs.    The founders designed the constitution to prevent a religious caste system for those who get 'in' and those rejected to serve in a position of influence.

There is plenty of history to suggest that fundamentalist religious beliefs can lead to extreme discrimination in public policy.  Sanders has reason to be cautious, but he must prove that Vought's beliefs guide his management decisions.    Sanders needs more than concern, he needs proof.

Both Vought and Sanders lack the evidence to support their bias.