The 'prize' that Gingrich received was not awarded in an attempt to defeat Romney, it was just for the purpose of Adelson getting his first choice for the Republican candidate. His first choice though was not his first priority. Adelson's first priority is the defeat of Obama by any otherwise acceptible Republican who is a strong supporter of the war mongering faction of Israel's leadership. That was a position that every Republican candidate except Paul tried to stake out. I doubt if Adelson cares where in a candidate's psyche that support comes from, he just demands that it is there. Gingrich was his first choice and there were no doubt many factors in play to bring him to that position but obviously it wasn't Gingrich or nobody for Adelson. Romney still fills the bill sufficiently by being a champion for corporations who vows to back up Israel whatever it chooses to do.  Adelson no doubt believes that Romney will do so.
 The background of Romney's religion may or may not have anything to do with his stated strong support for Bibi and his bad boys [Romney may not even be, in his heart, a believer, though I expect that he is] but I do not think we can reject Romney's words just because they are the same words that any pandering politician, and my default position is that they are all panderers most of the time, would spout to get that 100 million. We should give some credence to evidence supporting the idea that Romney is saying what he believes in this case, or at least consider that evidence. Is this another subject where his stated policy has changed for a particular election? He surely believes something. He would surely act or react in some way regarding  Israeli wishes and actions if he were to become President. I think that here we have some more clues which can lead to fair speculation.