From the Thomistic Philosophy website
Of course, my argument revolves around the assumption [mine] that in the absence of God, evil itself can only be an existential prejudice, a subjective predilection, a personal opinion. Not only regarding the existence of evil in and of itself but what is said to be evil as well. After all, there are many, many religious faiths that all subscribe to one or another God. And while to a faith they accept the reality of evil, there may be any number of differences between them regarding what particular behaviors are evil. And yet with immortality and salvation literally on the line given the behaviors that we choose on this side of the grave, what's a mere mortal to do? Must he or she not choose the One True Path? Why yours and not theirs?The Problem of Good (or of Natures)
The reality of evil actually gives implicit support for God’s existence and knowledge of his goodness. Since evil is real, and since, as a privation of goods or perfections that are supposed to be present in good things that exist in their own right, the occurrence of real evils actually depends on goodness, goodness which is found in varying degrees of perfections according to the objective natures in things.
Same with goodness in contrast to evil. All of the different understandings of that. Which one sends you up, which one sends you down?
You tell me what this...
"...goodness which is found in varying degrees of perfections according to the objective natures in things..."
...means in regard to the behaviors that you choose.
And all of the faiths that subscribe to the belief that it is their duty on Earth to proselytize...to save souls from damnation. Have they got it wrong?
Yes, if you believe in a God, the God, your God, and this God is the God that Aquinas is now in sync with in Heaven, you too can insist that all of this implies "there is an all-good Creator of good things, who is the objective standard of perfection". In your head, for example. Actually demonstrating this such that all rational people are obligated to believe the same...?This all implies there is an all good Creator of good things, who is the objective standard of perfection. Aquinas concludes to the reality of God on this basis in the fourth of his famous Five Ways of proving the existence of God.
The Fourth argument: https://en.wikipedia.org/wiki/Argument_from_degree
So, how would you go about demonstrating that all rational men and women are obligated to agree that one can -- must? -- connect the dots between this argument as an intellectual/spiritual contraption to the actual existence of the Christian God.