Interestingly, I've been reading some academic papers lately by historical critical scholars examining the explosive expansion of Christianity during the Roman empire. They're asking why so many people converted over a period of just 300 or so years, when religious conversion hadn't even been an idea before that. What I mean as, it was more common for people to bring different religious beliefs into their lives than it was too reject other beliefs in favor of only one.

Anyway, the answers are complex, but thing most of them acknowledge is The early Christian theme of inviting people into inclusive, non-judgmental community on Earth while promising eternal happiness in the afterlife.

Hell, according to most experts, didn't enter into it, because Christians didn't conceptualize hell much at the beginning of Christianity, and certainly not anything like traditionalist Christians do today.

Of course, I don't suppose traditionalist Christians are going to change their ideas about hell merely because that would be useful for proselytizing. But it might be interesting for some traditionalist Christians to start confronting the idea that hell was not an important part of early Christianity.