Rachel,
I think you’ve hit on a major impediment to the Gospel: the apathy of most agnostics and atheists to Christianity. Hell (perhaps pun intended ), I would rather debate somebody like Richard Dawkins who thinks Christianity is injurious, or a full-blown Calvinist, then somebody who is just indifferent, b/c, as you point out, it is so hard to relate to them. That being said, I think Pascal’s letters are excellent psychology as to why we avoid God, or why God remains hidden to many. Not that evangelists should be psychologists or something, but it is helpful IMO to know what sorts of things/ideas could possibly be motivating their reticence.
I think there are two ways to evangelize: one is the moral-guilt approach, which is often bound to alienate people, though I think Cindy is right and one can evangelize sort of indirectly in that fashion. Another way is to just 2 stay completely within the atheist worldview. If there is no God, then it is hard to see that there is a meaning to life, and most atheists, e.g. Bertrand Russell, Jean Paul Sartre, were quite frank about the futility and meaninglessness of existence w/o God. Some people are stoic to this, but many more I think are just avoiding it with the hum-drum of daily life.
Agnosticism or pluralism is more difficult, and I am often tempted to Deism myself, given, as you also observed, Christianity’s soteriological and denominational feuds. However, if Christian universalism is T, then God will eventually show us that, and not blame those who were unable to make a decision due to lack-of-information (i.e. universalism takes some of the pressure off and lets God work it out). Yet, the Good News is still important. It is kind of like self-cond as “wrong”. The Good News doesn’t need us to highlight it (at least not in a overly evangelistic sense [tho, according to some, Christians can never be too evangelistic ], we still must display holiness as best we can obviously); if it is T, then God will ensure its reception, even when it seems like nobody cares. We are explicit when asked, and assertive if called to defend it, but not desperate if it doesn’t seem to take root. Jesus was mostly content with parables, which he must have known would be misconstrued; if it were dire due to lack of time that He/w transmit the Gospel, then I think he would have been way more explicit.
If there is a deadline for salvation, this would be perhaps dangerous, admittedly, but even very traditional Christians such as Martin Luther (with whom probably most of today’s “traditional” Christians are largely unacquainted with the bulk of his work/theology) held out hope for salvation after death (e.g. his pastoral letter to Hans von Rechenberg).