Meanwhile Roslin. I know she believed the spiritual side before, but now I'm not quite so sure.

Actually (and again, I'm not certain how much of the earlier seasons you've seen) I think her use of religion was always calculated and involved a great deal of misgivings and self-doubt in the beginning. She came to believe that the scriptures were real in a way - like believing the bible is based on historical fact. But I'm not sure she was ever truly one of the faithful. She was shocked and uncomfortable when her priest suggested she was the dying leader from the scrolls of Pythia. When she splits the fleet from Adama, she uses her position as a prophet very mercenarily (is that a word?!) There's a wonderful scene where the prisoners on the prison ship are kneeling before her wanting her to bless them and she won't because it's not right until her priest tells her she has to - because she's put herself in that position and she's choosing to capitalise on it; and she does.

Michelle Forbes was powerful enough in the role to deliver it well and lessen the cheese factor and heighten the importance of it.

I completely agree.