Do they? Really? Should the Non religious party members also speak up?
No, because this is what happens when you do: "Democrats of my generation remember all too well the “Moral Majority” of the late 1970s and early ’80s that intertwined the Christian right with the Republican Party, blurring the lines of politics and religion in ways we can still see today."
That's not a one off, and when your political views are shapped by your religion you are promoting your religion. I don't want someone who's view of the world or our place in it is rooted in mythology - there's too much room for interpretation to effectivly govern.
By using differing interpretations of a holy book in politics the scism between religious sects gets pulled into the governmental sphere where it has no place. Just look at history (recent U.S. included) to see where mixing religion and politics gets us.