The GOP still has a reputation with those issues, and that reputation has become a hindrance. A lot of people don't vote for Republicans because they are seen as the party of Christian social issues.
Like who?
The kill your baby set? The I wanna get high set?
People who aren't happy with the way the mean old laws just won't let them be totally irresponsible?
Like, Liberals?
They aren't going to vote GOP anyway, if they want a liberal in office, they can just vote for the real thing.
The GOP has been running from the Right and sucking up to the former Leftists they called the "Middle".
No one is saying you have to go to church on Sunday, can't drink, and as I pointed out earlier, at least some of the folks who did not vote for the GOP Senate Candidate in ND this go-round still voted against legalized recreational pot. (still not a good idea, imho).
Blue Laws (generally a southern Democrat thing) are pretty much gone, and the only real reason the Homolobby pushed for "marriage" was so they could get insurance on each other's plans--incidentally why the preexisting condition clauses were in Obamacare--so they'd have to be covered. (1.3 million HIV/AIDS infected and counting, and guess who is the prime high risk group).
So just what "Christian morality" is the GOP 'treying to shove down anyone's throat'?
There is no opt out on a whole slew of progressive programs from putting condoms on pickles to lectures on S&M for grade schoolers, but you better not mention Jesus.
Give me a chance to vote to turn those tables and I sure will, but no one is advocating that--instead the GOP is rushing to embrace the perversion du jour and leave its traditional base behind, again, citing that they will vote GOP because they have no place else to go. (false dichotomy, as the GOP is discovering). No one is under any obligation to vote for that which they don't like, and the GOP is finding that out--from people on the Right.
If you do the math, there is nothing for the GOP to gain by discarding its traditional base in favor of a group of voters who, if they want a Liberal Socialist Government, can always vote Democrat and have the real thing.