I'm new here. When I first saw your nick, saw your subject of choice and read some of what you had written, I thought you might be another "Dan," Dan Barker. If you know who he is, you will probably take that as a compliment.
Have you considered that propositional truth is simply a matter of utility? Propositions are not useful because they are true, but true because they are useful; and perceived usefulness is relative to perceived needs and desires. To speak of truth in an absolute sense is to speak in terms of actual needs and desires, about which we can only speculate -- rationally, anyway.
Personally, I think all propositional frameworks for reality are simply models; and over the course of our lives we adopt, refine and discard them as our perceptions of their usefulness changes. The wise man knows that his ideas about life must remain operational; he must always remain open to new information or he is not being honest with himself. I think this point in particular is difficult for Christians and adherents of other exclusivist ways of thinking, because such people often feel that to allow for the possibility that they are wrong is to betray the truth -- rather than simply recognizing that they are fallible, that they could be wrong, but that they choose to believe such-and-such to be true. Of course, atheists not infrequently make the same mistake.
Very well spoken.