So, what do you think? Do you think its possible for a single religion to have an exclusive claim to all Truth concerning faith and morals? Do you think that Truth, or parts of it, is shared by various religions? Or do you think there is no Truth concerning faith and/or morals? So, what do you believe and why do you believe it?
The obvious assumption here is that
there is any truth concerning morals in the first place; for Christianity, or any religion, to possess all possible moral truths, moral truth must first exist, right?
And there's good reason to doubt that claims about morality are true or false at all- claims are true or false in virtue of having
truth-conditions; if the truth-conditions for a given claim, P, obtain, then P is true. But if P has no
truth-conditions, no circumstances under which it is true, then P is not
truth-apt. And moral claims appear to have no truth-conditions, and appear to not be asserting any particular claim about
how the world is (truth-conditions) but rather about how the world
should be. Ethical claims like "stealing is wrong" do not say, as it were, that this thing, stealing, has this property, "being wrong"- rather, "stealing is wrong" says that I don't think people should steal- I'm essentially issuing a directive or command. And "give me that stapler" is not truth-apt, because it has no truth-conditions; it does not describe the world as being any particular way. Similarly with ethical claims.
So in short, no, it is not possible for any religion to possess all moral truth, because there is
no such thing as moral truth to begin with.