Not that I fall into the categories to which you have alluded, but...
I for one espouse the truth of Scripture because I am called to be salt and light. The salt must season and the light must illuminate the darkness.
But of course none of this will convince on it's own merit - only God's Holy Spririt will convict the hearts of men. I choose to believe that God will use me in His purpose.
You see, you used the phrase "choose to believe" in your reply. Admittedly not with regard to salvation, but still...