>but for instance law makers can still use their papist or Mohammedan values when writing or voting for a law.

Most likely Baptist, Presbyterian, or Evangelical values. Just remember most domestic terrorists identify as protestant evangelicals. And it's Islamic, not Mohammedan. Unless you somehow gravitate towards the early 20th century.

I would expect any person to be guided by their values, be them religious or not. It's when they expect their religious dogma to become part of law that's an issue.