I do not consider it an insult, but rather a compliment to be called an agnostic. I do not pretend to know where many ignorant men are sure - that is all that agnosticism means.
The Bible give us a list of human stories on both sides of the ledger. On list of human stories is used examples -- do what these people did. Another list of human stories is used as warnings -- don't do what these people did. So if your story ever gets in one of these books, make sure they use it as an example, not a warning.