This whole argument is stupid. Most social conservative are also limited government/fiscal conservatives. There is no huge gulf. The problem here are the Bush/Romney Republicans.
I don't know about that- there is definitely a strain of social conservatives who are okay with big government, so long as they are in charge.
Look at the last 8 years- Bush rode to power on the shoulders of the Christian Right. The rest of the party came along, but that was his base contituency within the party. And we've spent 8 years expanding the government and its spending at the behest of that wing of the party.
The problem here are the Bush/Romney Republicans
Bush and Romney draw their support from different wings of the party. W is clearly a product of the social conservative/Christian Right part of the GOP. Those are the people who got him elected in 2000 and 2004.