I don't mean to suggest that these are everyday occurrences, and please don't misunderstand, I'm not here to argue the fallibility of god or the bible (at least here in this forum :mrgreen
based on anyones answer. I hope other non-believers will also respect that. I'm just genuinely curious how a Christian would answer this question.
Well, I answered from a Biblical (Protest Evangelical, which is not the same viewpoint as Catholic for reasons given) basis above, best I can offhand without engaging in research I don't have time for just the now.
What would a person, a Christian (we'll assume a serious and devout one), actually
do in such a circumstance? As opposed to theoretical maunderings?
My guess is it would depend on the details of the situation, as well as how long he had to think it over.
It's hard to imagine how this scenario would play out with no other options available unless it was time-constrained... since given time to think long enough more options can usually be found.
If it was time-constrained I expect a lot of it would come down to how badly does the person want to live vs how strong is his belief against taking another human life on purpose.
Things that might factor in could include whether they know the other person, whether the other person could be construed as being somehow responsible for the predicament in question, and whether they have a moment to realize the implications and discuss same... as well as things like age, dependents and so on. One might decide to tell the other "kill me and save yourself" if the others' life appears more valuable to them... for instance a 75yo in ill health versus a young adult with children.
Of course those are pragmatic considerations, while I suspect your interest was more in the matter of principle.
I'm going to guess your question is which sin is more "forgivable", killing the other person to live or letting one's self die rather than committing "murder".
The latter is probably going to be seen as the more moral choice by most... at least, most Protestants. I don't presume to speak for Catholics.
The former choice, killing to live, is more morally questionable but not unforgivable. Most Christians consider killing in self-defense to be morally acceptable. Even if one assumes the other person had no fault or responsibility in creating the incident, given that circumstances forced a choice to be made it could be argued to more closely resemble self-defense in principle than actual "murder" per se.
As I say though, TMK it is not a question directly and specifically addressed in scripture, and thus somewhat subject to interpretation.