@EZ: interesting point re: linguistic definition. I have no idea of the history behind the word "marriage", but you raise an interesting point which will be my mini-project for lunch break @ work tomorrow

(assuming I even get a lunch break, stupid Parliament passing all their damn legislation)
@Yitzi. You criticise anyone questioning your views for not having enough knowledge about Judaism (and fair enough, I daresay you are the authority for Judaism on this forum), yet you admit to having little knowledge of other religions.
Despite that, you still choose to stick to a blanket statement of "all religious morals are fixed".
Take the example of wearing a burqa - that is, the "moral" of modesty for women. A brief Google search will reveal that there is much dissension amongst religious scholars as to whether the Quran actually mandates the wearing of the burqa, or whether mere modest dress is required.
Based on the same "higher authority", there are myriad, very different interpretations. Some women wear a burqa, some the hijab, some other variations (I forget the names), some no head covering at all, some (like my proudly Muslim friend) even wear short, strapless dresses on formal occasions. Not only this, but many women have switched from one to the other based on changing life circumstances. I am wondering how on earth you can justify defining this moral as "fixed". (And I'm sure this isn't the only example, but it is the only one I have studied.)
Further, if as you say fixed morals are sufficiently so when they are fixed per the individual's perceptions, how can you be sure any random person sharing your religion also shares your interpretation of whatever text(s) govern it? I do not see any difference between that situation and one where the atheist has his/her own morals. Both are unpredictable.
Why not just come out and say "I would prefer a Jewish PM"? Unless you can exhibit a similar level of understanding of (at least) the main religions as you demand from us on Judaism, that is really the most blanket statement you could make, and even then it is a rather shaky one, considering you've proven /0's point that religions are unpredictable and certainly not uniformly "fixed".