Some politicians, including Joe Lieberman, seem to want to blur the line between religion and politics. His view about religion and private life is offensive to those of us who do not believe in God. His view about religion and public life is dangerous. It just ain't necessarily so. It can also encourage fanatic beastliness toward nonbelievers.
Morality is belief-neutral.
You can act morally toward your fellow human beings because God commanded it. But you can also do it out of a kind of moral instinct. If you were not blighted emotionally by toxic parenting, treating others with a tincture of the love that came to you as a child is natural. Morality also reflects values, and religion has no monopoly on these. To put it crassly, moral conduct usually pays off.