I agree with your judgment call on this one.
To be clear, no moderator was involved in handling your flag. The flag put it in the review queue and enough people there counter-flagged it (disagreed with the flag) that it got dismissed before a moderator even saw it.
And I disagree with whoever the community reviewers were. Here's why.
Yes, it's a pretty clear cut "truth" question. Given the question alone, it would be possible to answer it in a way that is appropriate for this site by outlining what various Christians believe about this issue. One or two answers ever attempt this. However the answer that was accepted by the OP does exactly the opposite of what we are looking for here—it disavows giving an answer based on extant Christian doctrines and goes straight for the "truth" argument. The fact that such an answer was not only solicited but marked as the accepted answer clearly demonstrates the intent on the asker to look for a truth position rather than learn about extant Christian teachings. The addition of other answers starting out with "I [dis]agree with X" is another clear sign that at least some of the answers are off track and the fact that they are not NAA material (they properly address the question that was asked) puts the question at fault.
I have gone ahead and unilaterally closed the question and invite anyone who disagrees to post here with their reasoning for how this question fits our site guidelines.