Here's one complicated attempt that I found recently. It's set up a little differently that I'm used to, but it's not a big deal. It's 'The Moral Argument from Evil' from Dean Stretton:
- A1. The most rational theists know (i.e., have a justified, true belief) that God exists.
- A2a. For any possible world W, if God exists in W, then every instance of evil in W is objectively justified.
- A2b. If God exists, then there is objective justification for any actual instance of evil, including those evils for which there is a human onlooker
- A2. If God exists, then there is objective justification for every actual instance of evil, justification that will occur even if no onlooker intervenes to stop or prevent that evil.
- A3. Some members of the class of most rational theists (as I have defined that class) are theists who know A2.
- A4. Some of the most rational theists (namely, those who know A2) know that there is objective justification for any actual instance of evil, justification that will occur even if no onlooker intervenes to stop or prevent that evil.
- A5. If human person P knows that there is objective justification for evil E, and that this justification will occur even if P does not intervene to stop or prevent E, then P is morally justified in allowing E to occur.
- A6. Some of the most rational theists (namely, those who know A2) are morally justified in allowing any actual evil to occur.
- A7. If the most rational theists know that God exists, then some of those theists (namely, those who know A2) are morally justified in allowing any evil to occur.
- A8. Even the most rational theists (including those who know A2) are not morally justified in allowing just any evil to occur.
- A9. Even the most rational theists do not know that God exists.
- A10. If the most rational theists do not know that God exists, then no theist knows that God exists.
- A11. No theist knows that God exists.
- A12. For any given theist, that theist’s belief that God exists is either false or unjustified.
- A13. If God exists, then some theists are justified in believing that God exists.
- A14. If God exists, then no theist has a false belief that God exists.
- A15. If God exists, then some theists know (i.e., have a justified, true belief) that God exists.
- A16. It is not the case that some theists know (i.e., have a justified and true belief) that God exists.
- A17. God does not exist.
Let's check it out.
- A1. The most rational theists know (i.e., have a justified, true belief) that God exists.
- A2a. For any possible world W, if God exists in W, then every instance of evil in W is objectively justified.
- A2b. If God exists, then there is objective justification for any actual instance of evil, including those evils for which there is a human onlooker
- A2. If God exists, then there is objective justification for every actual instance of evil, justification that will occur even if no onlooker intervenes to stop or prevent that evil.
- A3. Some members of the class of most rational theists (as I have defined that class) are theists who know A2.
- A4. Some of the most rational theists (namely, those who know A2) know that there is objective justification for any actual instance of evil, justification that will occur even if no onlooker intervenes to stop or prevent that evil.
- A5. If human person P knows that there is objective justification for evil E, and that this justification will occur even if P does not intervene to stop or prevent E, then P is morally justified in allowing E to occur.
So this argument goes on for another twelve A-Ps. It's dead right here. I'll carry on anyway to see how it goes.
- A6. Some of the most rational theists (namely, those who know A2) are morally justified in allowing any actual evil to occur.
- A7. If the most rational theists know that God exists, then some of those theists (namely, those who know A2) are morally justified in allowing any evil to occur.
- A8. Even the most rational theists (including those who know A2) are not morally justified in allowing just any evil to occur.
- A9. Even the most rational theists do not know that God exists.
Either way, I also have a justified belief, based on heaps of evidence. I know it with the same certainty that we know Abraham Lincoln existed. Perhaps the existence of Lincoln was a foolproof conspiracy, but that amount of doubt doesn't seem worth bothering with.
This premise asks way too much from the evidence. Scientific theories rarely have 100% certainty, and that's what this premise wants.
- A10. If the most rational theists do not know that God exists, then no theist knows that God exists.
- A11. No theist knows that God exists.
- A12. For any given theist, that theist’s belief that God exists is either false or unjustified.
- A13. If God exists, then some theists are justified in believing that God exists.
- A14. If God exists, then no theist has a false belief that God exists.
- A15. If God exists, then some theists know (i.e., have a justified, true belief) that God exists.
- A16. It is not the case that some theists know (i.e., have a justified and true belief) that God exists.
Seeing as we only have sound arguments and evidence for the existence of God, and not a single one for his non-existence, I'd call that a justified belief. Piling on to that the personal relationships that so many Christians have experienced, we can even claim certainty until we're proven to all be under some delusion.
- A17. God does not exist.
Let's check out a dumbed down version to see if I can grasp it better. Maybe I missed something important that was meant to convince me.
A1 to A2 – If God exists, then all instances of evil are morally justifiable by definition.Hmm. This seems to be a whole lot clearer in it's plain nonsensicalness. A9 to A17 just doesn't follow at all from the rest of it. What does a persons behaviour or knowledge have to do with the existence of something else? Maybe it could be that God exists, all evil is justified, and human beings rebel against him by trying to prevent evil. God would still exist, just not in the way we think he does.
A3 to A7 – If all events are morally justifiable, then some believers know that they should not try to stop any instance of presumed evil.
A8 – Yet they do intervene.
A9 to A17 – Therefore their own behaviour proves that God does not exist.
Although as I've explained in the longer version, several of the premises don't work when squared against Christianity.
I'm a little embarrassed to have spent so long looking at this argument as though it was worth considering.