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1.) There must be a universal moral law, or else:
a. Moral disagreements would make no sense, as we all assume they do.
b. All moral criticisms would be meaningless (e.g., “The Nazis were wrong.”).
c. It is unnecessary to keep promises or treaties, as we all assume that it is.
d. We would not make excuses for breaking the moral law, as we all do.
2.) A universal moral law requires a universal Moral Lawgiver, since the law itself:
a. Gives moral commands (as lawgivers do).
b. Is interested in our behavior (as moral persons are).
3.) Further, this universal Moral Lawgiver must be absolutely good:
a. Otherwise all moral effort would be futile in the long run.
b. The source of all good must be absolutely good by its very nature.
4.) Therefore, there must be an absolutely good Moral Lawgiver.
Christianity Satisfies Our Deepest Intuitions:
1.) A sense that things ought to be a certain way
2.) A sense that things are not that way; the world has somehow gone upside-down
3.) A sense that human beings are marked both by incredible depravity and by immense dignity and glory.
The Argument from Desire:
1.) We have natural, intuitive desires which we call hunger, thirst, loneliness, etc.
2.) There exist things to meet those desires: food, water, community, etc.
3.) We also have a natural, intuitive desire for meaning and purpose beyond what this temporal life can meet; essentially, a desire for an eternal life at rest in the arms of illimitable love.
4.) Therefore, it is reasonable to believe that there exists something beyond the bounds of this temporal life which can meet that desire.