Is the question 'What would I do if God told me to do it? or 'What would I do if a 'voice in my head' told me to do it?' You seem to have collapsed the two questions, and they are not the same. As to whether or not I would be concerned, I would be very concerned-- I wouldn't find it easy to kill a person, but, if God told me to do it. But this isn't all that significant, is it? I can imagine being told by my father that I must kill someone, and doing so, because of the trust that I have in him, and in his concern for my well-being. I assume that many feel the same way about their parents and about their spouses. There are people who have faith in certain other people who will act on this faith, and there are people who say they have faith in another person, but really don't, and, of course, there are people there are cowards.