The Establishment Clause prohibits government from making adherence to a religion relevant in any way to a person's standing in the political community.
It matters enormously to a successful democratic society like ours that we have three branches of government each with some independence and some control over the other two. That's set out in the Constitution.
Next Article
I believe that for the small numbers of Jewish people in the United States they exercise a tremendous amount of influence on the affairs of government.