Before you hastily apply a religious litmus test against him
(knowing that's unconstitutional, of course), be sure you know if his personal beliefs will affect his public behavior. I remember a man whose nomination as Surgeon General was widely opposed for his personal religious beliefs. He believed abortion was wrong, so of course he was wrong and had to be stopped. He was confirmed anyway and turned out to be one the best Surgeon Generals we've had in recent memory, C. Everett Koop.