The laws and policies of the federal government have a huge role, for instance abortion and gay marriage, and homosexual policy in regards to the military, federal employment and immigration, etc.
Christianity can do fine, as long as the politicians who are elected don’t go against it, and besides, we want a culture that reflects our God fearing ways.
Never support a social liberal, non God fearing candidate at ANY level of office, because not only will he be pushing left wing social politics, but he might someday reach the Congress, or Senate, or Presidency and be making federal policy.
If you create a power lever the evil will take control of it.
For some reason you can’t grasp that fact.