Conservative values play a big role in American politics too. It’s about what the people want. If one day people decide they don’t want religion in their lives, the government will drop religion from politics. It’ll cease to be of any use.
Nothing would make me happier than a secular Pakistan, a place where you have freedom of religion or from it. But there is a lot of work that needs to be done before we can even think of getting rid of religion at the State level.