The argument from morality is an apologetic that pops up from time to time and has been wielded with varying degrees of efficacy (see Mere Christianity, the thread entitled "Objective Morality, Evidence for God's Existence"). To summarize, it follows the following form:
1. Objective moral laws imply a moral law-giver. This is a contentious premise, which is why a competent user of this apologetic will preface the Argument from Morality itself with a discussion of this premise.
2. Objective moral laws exist. This is also a contentious premise, which is why I personally prefer the moral argument as an apologetic to bolster faith, rather than to inspire it.
3. Therefore, a moral law-giver exists. If you thought the first two were contentious, you've not yet seen anything.
In terms of formal logic, this syllogism is perfectly valid.
1. If moral laws, (p), then moral law-giver (q).
2. Moral laws (p).
3. Therefore moral law-giver (q).
However, its soundness as an argument, that is to say, the accuracy of its premises, is greatly disputed. For the purposes of the rest of this writing, I shall be using the term "atheists" to mean "atheists who take a belligerent attitude towards religion, that is, the type of atheists one would expect to find in a Christian forum." There are two sorts of disputes atheists have with the Argument from Morality. The first sort is disputes of argument; that is to say, they take issue with the accuracy of the two premises. The second sort I shall call disputes of evidence; these disputes are raised against the conclusion that, should the Argument from Morality be accepted, the Christian God cannot be this moral law-giver because He is not a moral god. I chose these terms because, in the first case, those that argue against the user of this apologetic take issue with the argument itself, that is, they believe the Argument from Morality to be invalid in its entirety, while in the second case, they merely believe that the Christian God does not fit the evidence provided by the Argument from Morality.
To those who follow the first course, I would say little. Not because I believe that they are correct, but because I find the argument from morality is a wonderful thing to say all at once with no dissent (as did C. S. Lewis), but is very difficult to argue against someone. Far better to argue from evidence of the resurrection, or ontology. The argument from morality is very difficult to use in the context of a debate because it first requires establishing a tricky point of philosophy as one premise (tricky, but doable -- Lewis managed it with flair) and then for the next premise requires that one wrangle an objective law out of subjective experience, all the while against the naysaying of atheists, whose subjective experience is every bit as subjective and experiential as one's own. Again, I believe Lewis managed this as well, but as I have said, he did not suffer from direct and precise arguments in response to his own. Of course, it is important not to hold those arguments against those who make them: one might as well hold against it the rabbit's flight from the hounds, or the mighty struggle of a fish against the fisherman.
To those who follow the second course, I would say perhaps a bit more, not out of any mistaken hope that it would find purchase in their hearts but out of a desire to explain why their argument finds no hold in my own heart. Those who argue that the Christian God does not meet the moral requirements to be the Moral Law-Giver point to such occurrences as the Biblical genocide of the Canaanites. With this point I must disagree, although it is important that I elaborate on why. I do not disagree with this point because I feel there is a neat and tidy solution to this problem. I don't believe that if one merely looks at it from the right angle, all of a sudden from our point of view that which seems wrong will become right -- were that the case, our morality would not be objective. Rather, I find it likely that there is a crucial fact which has not been revealed to us humans, and perhaps never will. You do understand the difference between that which seems moral from a certain point of view, and that which seems moral as soon as one has all the facts? I am certain you do, but to become even more certain: the one is clearly not morally objective, as the morality changes with your point of view. The other, however, can be said to be morally objective, as the morality of the situation becomes apparent as knowledge is gained. That this gained knowledge results in a shift of perspective is immaterial. It is the knowledge learned, not the perspective shifted, that makes the truth apparent.
Now it may seem obvious to Christians reading this that I have raised the Argument from Morality from the shadows of the disputes of evidence. Well, I have, but I have not. From the point of view of a Christian -- that is, one who is prepared to take some things on faith, being convinced by his reason that the Christian God is real and true -- I clearly have. It is not so difficult at all for a Christian to conceive of facts which -- though we cannot know them to be true -- would demonstrate that God does, in fact, fit the description of the Moral Law-Giver. That allows a Christian, hearing this argument, to settle back and focus on the Argument from Morality itself, by doing his best to establish premises one and two as true. So, in that sense, I have 'fixed' the Argument from Morality.
However, I have also failed to save the Argument from Morality, and here is how. An atheist, being exposed to the Argument from Morality by a Christian who seeks to convert him, cannot reasonably be expected to take on faith any part of the argument whatsoever. That is not just putting the cart before the horse; that is insisting that the cart, being in front of the horse, should now proceed to tow the horse to its destination. Now, one can make all sorts of pretty arguments to attempt to explain away the disputes of evidence; however, one is left with the central facts that the Book we revere tells us God told the Israelites to commit genocide, and they did, and that though it is not unreasonable for already-convinced Christians to continue to believe in a moral God in spite of this, it is an absolute non-starter to expect to convert atheists on the basis of this argument.
Many will take this as an attack on the Christian faith; I assure you, it is not. Though God reveals himself in many ways (and I do not dispute that one of these ways is moral objectivity) it is unreasonable to expect moral objectivity to, by mere virtue of being God-given, be a workable argument for God. After all, God gave us squirrels, did he not? If you truly believe that any way in which God reveals himself is a workable argument for His existence, then go and preach the Argument from Squirrels. If you are successful, then you never needed the Argument from Morality in the first place. If not, I suspect you will have learned a valuable lesson about the nature of apologetics.
1. Objective moral laws imply a moral law-giver. This is a contentious premise, which is why a competent user of this apologetic will preface the Argument from Morality itself with a discussion of this premise.
2. Objective moral laws exist. This is also a contentious premise, which is why I personally prefer the moral argument as an apologetic to bolster faith, rather than to inspire it.
3. Therefore, a moral law-giver exists. If you thought the first two were contentious, you've not yet seen anything.
In terms of formal logic, this syllogism is perfectly valid.
1. If moral laws, (p), then moral law-giver (q).
2. Moral laws (p).
3. Therefore moral law-giver (q).
However, its soundness as an argument, that is to say, the accuracy of its premises, is greatly disputed. For the purposes of the rest of this writing, I shall be using the term "atheists" to mean "atheists who take a belligerent attitude towards religion, that is, the type of atheists one would expect to find in a Christian forum." There are two sorts of disputes atheists have with the Argument from Morality. The first sort is disputes of argument; that is to say, they take issue with the accuracy of the two premises. The second sort I shall call disputes of evidence; these disputes are raised against the conclusion that, should the Argument from Morality be accepted, the Christian God cannot be this moral law-giver because He is not a moral god. I chose these terms because, in the first case, those that argue against the user of this apologetic take issue with the argument itself, that is, they believe the Argument from Morality to be invalid in its entirety, while in the second case, they merely believe that the Christian God does not fit the evidence provided by the Argument from Morality.
To those who follow the first course, I would say little. Not because I believe that they are correct, but because I find the argument from morality is a wonderful thing to say all at once with no dissent (as did C. S. Lewis), but is very difficult to argue against someone. Far better to argue from evidence of the resurrection, or ontology. The argument from morality is very difficult to use in the context of a debate because it first requires establishing a tricky point of philosophy as one premise (tricky, but doable -- Lewis managed it with flair) and then for the next premise requires that one wrangle an objective law out of subjective experience, all the while against the naysaying of atheists, whose subjective experience is every bit as subjective and experiential as one's own. Again, I believe Lewis managed this as well, but as I have said, he did not suffer from direct and precise arguments in response to his own. Of course, it is important not to hold those arguments against those who make them: one might as well hold against it the rabbit's flight from the hounds, or the mighty struggle of a fish against the fisherman.
To those who follow the second course, I would say perhaps a bit more, not out of any mistaken hope that it would find purchase in their hearts but out of a desire to explain why their argument finds no hold in my own heart. Those who argue that the Christian God does not meet the moral requirements to be the Moral Law-Giver point to such occurrences as the Biblical genocide of the Canaanites. With this point I must disagree, although it is important that I elaborate on why. I do not disagree with this point because I feel there is a neat and tidy solution to this problem. I don't believe that if one merely looks at it from the right angle, all of a sudden from our point of view that which seems wrong will become right -- were that the case, our morality would not be objective. Rather, I find it likely that there is a crucial fact which has not been revealed to us humans, and perhaps never will. You do understand the difference between that which seems moral from a certain point of view, and that which seems moral as soon as one has all the facts? I am certain you do, but to become even more certain: the one is clearly not morally objective, as the morality changes with your point of view. The other, however, can be said to be morally objective, as the morality of the situation becomes apparent as knowledge is gained. That this gained knowledge results in a shift of perspective is immaterial. It is the knowledge learned, not the perspective shifted, that makes the truth apparent.
Now it may seem obvious to Christians reading this that I have raised the Argument from Morality from the shadows of the disputes of evidence. Well, I have, but I have not. From the point of view of a Christian -- that is, one who is prepared to take some things on faith, being convinced by his reason that the Christian God is real and true -- I clearly have. It is not so difficult at all for a Christian to conceive of facts which -- though we cannot know them to be true -- would demonstrate that God does, in fact, fit the description of the Moral Law-Giver. That allows a Christian, hearing this argument, to settle back and focus on the Argument from Morality itself, by doing his best to establish premises one and two as true. So, in that sense, I have 'fixed' the Argument from Morality.
However, I have also failed to save the Argument from Morality, and here is how. An atheist, being exposed to the Argument from Morality by a Christian who seeks to convert him, cannot reasonably be expected to take on faith any part of the argument whatsoever. That is not just putting the cart before the horse; that is insisting that the cart, being in front of the horse, should now proceed to tow the horse to its destination. Now, one can make all sorts of pretty arguments to attempt to explain away the disputes of evidence; however, one is left with the central facts that the Book we revere tells us God told the Israelites to commit genocide, and they did, and that though it is not unreasonable for already-convinced Christians to continue to believe in a moral God in spite of this, it is an absolute non-starter to expect to convert atheists on the basis of this argument.
Many will take this as an attack on the Christian faith; I assure you, it is not. Though God reveals himself in many ways (and I do not dispute that one of these ways is moral objectivity) it is unreasonable to expect moral objectivity to, by mere virtue of being God-given, be a workable argument for God. After all, God gave us squirrels, did he not? If you truly believe that any way in which God reveals himself is a workable argument for His existence, then go and preach the Argument from Squirrels. If you are successful, then you never needed the Argument from Morality in the first place. If not, I suspect you will have learned a valuable lesson about the nature of apologetics.