While there are a large number of Evangelicals in the US, they aren't all Republicans. A fair number are actually Democrats. The problem with the Republican Evangelicals is that they scare away moderates.
People can't agree with each other about religious matters, but then can generally agree about money. The first an foremost concern in regards to tax money, is that it is spent wisely. This is what killed the GOP in 2006. They blew the budget. Granted, there were two wars going on, but they still expanded the size and cost of gov't, spent everything they had and more, and generally turned away from hopes of fiscal conservatives. This led to their downfall...
The Republican party needs to cut the social conservatives out and pursue a more socially moderate stance. Next, they need to get down to brass tacks. Pursue reduction in gov't handouts, subsidies, entitlments, etc... cut taxes, or pursue a flat tax rate. Military spending is okay, but focus on getting good value out of projects. Military spending can't just promise better weapons and equipment. Military projects need to be able to show some financial advantage versus the status quo. This means not only must they give our soldiers better effectiveness, survivability, etc... but they must be easier and cheaper to maintain, transport, and upgrade.
Money is more important to people than social issues. If something is too expensive, like healthcare, there is always a reason. It isn't necessarily greed. It could be the astronomical price of malpractice insurance, created by uncontrolled litigation. But, our gov't is made up of lawyers who wouldn't want to cut their buddies' purse strings.
It's time to pursue a more libertarian (little 'L') when dealing with social issues, and a more conservative view on fiscal responsibility.
