If you believe that the Earth is 6000 years old, you’re not “brave”; you’re an idiot.
Much is made of the “elitism” of secular humanists, but a smugness associated sectarian identification is not restricted to those who put more stock in scientific inquiry than in the literal translation of the Bible. A sense of superiority for being more “moral,” “pious,” or “patriotic,” is probably no less uncommon on one side of this debate than the sense of superiority for being “educated,” “worldly,” or “reasoned,” on the other. One side just seems to take more offense, although I could be wrong.
Sadly, another part of the human condition is the closing off of empathy to those who fall into a different group. Of this, both sides are guilty, as is nearly every human involved in some point of contention with another. Given our finite capacity for understanding, and a limited amount of time to learn why the others may be acting so irrationally, the path of least resistance will almost always be to assume an inferiority, a value deficit of some sort.