Continue to take these moral stances, sure. But as planks in the platform they spell doom, not because they are unpoular, but becasue they do not align with the cohesive small government message that is really important. The future of the republican party is not "conservative:, it is "libertarian".
Once we shrink the government, other institutions, like churches, will regain importance. Then you can fight the cultural battles where they belong...in the hearts and souls of reasoning individuals.