I think it is clearly stated in the founding document of this nation. I think you "assume" too much. God doesn't "want" anything, He doesn't have to "want!" You are making the typical Atheistic arguments about God, by applying ignorant human standards to His motives and intentions. It's kinda stupid to do that. It shows, not only do you have a lack of understanding as to the founding principles of America, but you also have a fundamental lack of understanding of God. I won't call your spiritual faith into question here, but it appears you have little or none.
There is something important you need to remember here... Social conservatives don't need you to approve what they believe, they don't need to prove what they believe to you. They know and understand what the founding principles of this nation are, and they refuse to accept the Atheist-borne concepts which refute these principles. You can talk until you are blue in the face, social conservatives know what they know.
I haven't really touched on the connection between social conservatism and fiscal conservatism, but I will do this now. To presume we are given our freedoms and liberty by government, it requires you to believe in government as the solution for all our problems. To depend on government to fix these problems and find the answers. Social conservatives believe our government is there by the grace of God, to protect our endowment of freedom and blessings of liberty. It need not be large and intrusive, since our power doesn't come from government or man. I realize this may appear quite simplistic in nature, but it is indeed, very fundamental and profound. There is a connection between the beliefs of social conservatism and fiscal conservative policies, and it all goes back to our fundamental belief in the founding principles.