[John21]

Suppose there was a religious sect who believed that anyone who didn't believe in their God ( lets call It - ABBA ) should be killed. And not only should the non-believer be killed, but it was a proof of their belief in ABBA whenever they killed someone who didn't believe in Him.

Assuming you were forced into a confrontation with said believer, would you kill him before he killed you?

Please indicate if you've had an actual encounter with a person holding the aforementioned belief, or if your response is more of a hypothetical (doll-house rhetoric) nature.