I've never thought "you better believe what I believe or you will go to HELL for eternity!" was a very good sales pitch for converting people to Christianity. So you're telling non-Christians that all of their relatives who've already died are currently being tortured (or some kind of unpleasantness, depending on the exact group) that will last forever and ever? I've always preferred the Catholic approach of only a very small number of truly unrepentant and evil people go to Hell, while most everyone else goes to Purgatory first (whether they're Catholic or not, or even Christian or not) to atone for their sins and be cleansed of them before eventually going to Heaven to be a lot more palatable.

Of course whether something is palatable to me personally doesn't have any real bearing on whether it's true or not, but since there's never any strong evidence for any religious belief, people are going to believe what they're comfortable believing.