How exactly can I explain to someone where non-Christians went before Christ was born and died. Where did the Jews go? Would it be fair for God to send to hell all the other types of people who were born in different lands and had no control over that? What if they tried to be good people? What if they would have come to Christ if given the chance?
Also: Where do unborn babies go? Aborted ones? What about infants who die before they can be baptized? Do they go to hell?
In general, and I say this with sensitivity, you should consider to step back a minute. These are unspiritual questions. So, of course, they will be common. But, the answer is spiritual. And, what I mean here is that you can not, ultimately, explain spiritual matters to people who are not spiritual.
I do not mean by this the person may be unsaved. As Paul pointed out he could no go into some matters with believers "because you are in the flesh". As in, mortal human beings.
Jesus took one question like this, which was asking about marriage and the resurrection. He really did not answer the question directly, but pointed out that they "do not know the power of God", and that those participating in the resurrection "will neither be married nor taken in marriage, but as angels of God".
Now, did Jesus get into there what he meant? He did not. One can certainly make a number of likely correct inferences, if one truly thinks about it. While, also, considering the other verses, such as the ones likening the end to a marriage ceremony where anybody and everybody is a participant. (Such as the 'ten virgins' which should not be thought as only 'ten Christian virgins' and certainly not 'male or female', but anybody, and everybody. Or, like the parable of the sheep and the goats. Where anyone might have found themselves saved, and anyone might have found themselves rejected. Again, not necessarily 'Christian', nor 'male', nor 'female'.)
Put in more human terms, I do not mind using a metaphor I once had a distinctly spiritual person use with me: that it is impossible to understand Heaven if you have not been there. It can be likened to not being able to understand some distant and very foreign land, like Japan. You just can not know unless you have lived there.
And how much more distant then this world, and how much more alien then this world, might Heaven be from earth?
So, stick to the message. Can the message be presented by considering such questions? I certainly do think so, as long as one does stay to the message. And what is that message? Is it one of eternal damnation for all? There are very many shown to have been saved in the end, in Revelation.
The message is that the Kingdom is now, and we may find the Kingdom by following Jesus. That, in finding the Kingdom, we find immortality and everlasting joy.
Jesus certainly did point out the world will end, and that those who are of the world will lose what they have. But, then, all must give up the world and follow Him now. Or what they think they have will be taken from them.
Otherwise, if you are truly stumped, maybe you should ask yourself what are the real answers here? And be wary, as people do believe what they want to believe, based on their own preferences.
I certainly do not consider a message of damnation and hellfire to be the one I see, when I read of what Jesus had to say about that Day. Rather, it is one where some will find that door shut to them, and others will find entry. Will it be forever shut to them? Some say, "so", others say "no", and still yet others say, "You are entirely missing the point".
That Day certainly is said to be one of "darkness and dread", and we are asked not to forget that.
But, this does not mean people have generally believed correctly on the specifics of "that Day"...
Indeed, you are not even called to follow mainstream beliefs anymore then you are called to travel the wide road of destruction which many walk.
But, such matters are not things one can have a simple "yes" or "no" to. Such matters, one must see for their own selves, to know and be sure.
