I think in this case it would be more similar if all of the party members were part of the same minority denomination. While most U.S. polititions are Christian

I think in this case it would be more similar if all of the party members were part of the same minority denomination. While most U.S. polititions are Christian, they are members of mostly independent churches that are organized into separate denominations. That is one reason that we have generally been wary of Catholic politicians - because we don't want our government to be under the influence of the Pope.