I suppose this argument turns on the question of balls as a theology, or solid, real-world balls.
I am, by many accounts, going to Hell. I'm a minion of the Great Satan, according to the Jihadists, I'm a sinner by rights of not accepting Jesus as my personal savior, I've not only had sex out of wedlock but in possitions other than God had intended Man - although in my middle age, I often regret this in the morning. I enjoy not only Rock music, but clearly Satanic bands like Rush, BOC, KISS, Motorhead, AC/DC - I have my Joan Biez moments, too, but I must be true to the light which has saved me - namely Joan Jett & The Blackhearts 'I Love Rock n' Roll' which steered me from the horrible, flavorless path of Top 40. Pa-raise Rock and/or Roll!
But I usually greet the hellbound prognostications with apathy. Hell is for monotheists, or at least the fire and brimstone lakes of blood disco hell that I've been told await me. I've worked retail during the Holidays, your Hell has no sting for me. This isnt courage - there is no balls to saying 'bite my shinny metal ass' to the Moral Majority. Fun, yes, a moral imperitive, yes. Ballsy, no.
As for solid, real-world balls to the walls - its the religious types hands down. Whether they're in suicidal charges yelling Deus Vult or blowing themselves to bits yelling Allahu Ackbar, or pledging their blood for Odin, theres a fearless fanaticism which you just cant get without deity. Without that absolute faith that you're gonna nail 40 virgins in Paradise, forever. Not my idea of paradise, I'd much rather forty women of questionable morality, 40 women of buxom qualities who serve me on-tap beer while dressed in a variety of revealing costumes. Oh Catholic School Girl wench, assist Pussycat Girl with my beer! Chop chop! Oh, Dominatrix wench, your cleavage is blocking Family Guy! Come closer so that they may entirely bot it out, for it is that sucky roadtrip episode!
Even ballsyer than killing infidels in the name of which ever brand of god/godess/other you've chosen, is when you have no power. No mighty sharp sword, no bombs, no AKs.
Just faith.
The Prophet Mohammed, going to Mecca unarmed on pilgrimage, even though the people in power had vowed to kill him. Martin Luther King marching in the deep South, at a time when people of his skin color frequently got hanged by mobs for being in the same town with white women.
You cannot triumph in situations like that without the irrational belief that your course is a divine one, that you've picked the right path, even though every power you know is arrayed against you. God is on your side, you have faith, and its not a rational matter. Bravery rarely is - it is the irrationality of religion which enables the evil to conduct suicide bombings that kill innocents, but it is also the irrational power of religion that enables the innocent to rise above their opressors.