The Issue of Morallity

Many people in this nation would readily admit that there is a problem with modern standards and behavior. Many are disgusted at the laws we are passing. Many more are disgusted with the conduct, or in some cases lack thereof, exhibited by our country's leaders. Many want to see things change, but the true problem is almost never addressed.
Why the sudden plunge in behavior and standards? In all probability, it wasn't so sudden of a change. Our society has been gradually worn away. It all started with the very first fluctuation of moral standards, whenever that was. As soon as morals were demoted to a matter of personal opinion, our fate was sealed. We are now on an almost irreversible path to self destruction, much like ancient Rome. As soon as you remove the source of absolute moral truth, things will go downhill.
Many people argue that the only sources of morality are religion and personal opinion. I don't disagree. While there are some natural inhibitions we follow by instinct, most of what we know as far as right and wrong comes from religious teaching. However, this doesn't change things. We still need an absolute source of morality. In fact, America's original laws were all based on the Bible and Christian morals. This wasn't discriminatory, it was logical. People of other religions could still practice as they wished, since these laws were common among all religions. No murder, no stealing, no cheating, etc; these are basic laws. The problem came when we started tampering with them under grounds that they were too strict, discriminatory, or unconstitutional. Granted, some laws such as those allowing slavery had to be changed. But if one looks into the reasons for racial equality, they are mostly Christian. So these changes were merely an improvement on our laws, moving us closer to religious morality. The opposite is true with laws allowing gay marriage, abortion, and the like. These are the laws moving us away from morality, these are the issue and a contributing factor to our nation's overall state.
I am not saying that we should be a theocracy, or even go so far as to impose strict Christian laws. Freedom of religion must always be maintained. What I am trying to say is that religious morality should be the predominant guideline in lawmaking. It's obvious that a law requiring people to go to church, or save sex for marriage, or tithe to a church would be way too far. These are laws unique to Christianity, and so making them national law would be infringing freedom of religion. But ignoring a basic law like “don't murder,” which his common to all major religions, is a bad idea. The legalization of abortion, for example, did exactly this. We are slowly lowering our standards, and if we don't stop, we won't have any left.
We need a definite source of morals. This doesn't necessarily have to be the Bible, but there has to be something we bass our laws on, and Christianity is what we've started with. Failure to stop this decline will result in the downfall of our country, and possibly the world.