It's a God-given talent.
BTW, "faith" is an interesting word. Have you thought about its meaning? Is your faith that God doesn't exist so strong that you would be willing to place your life on the line? Would you be willing to risk death for your "faith"? If you had to declare right now that you are 100% certain that God does not exist, and if you are right, nothing happens, but if you are wrong, you would be killed, would you have the faith to make that statement?