I'm not sure that's correct. Everything I've ever been told by Christians is that you must follow Jesus, specifically, to get into heaven and that living a good life is secondary. Way way down on the list compared to being a Believer. It's a cult (and I mean that in a general sense not a derogatory sense), so of course they frame things that way. Members of the cult get the express escalator to heaven no matter what they did in their life. That's why Christians are so "forgiving" of people who make deathbed confessions / repent. It's all good, because you joined the cult before you died so you won the life lottery. It doesn't matter if you were the worst sinner before that as long as you sincerely beg Jesus for salvation.
You don't get in if you just live a good life, because that message doesn't maximise converts. All religions work this way because religions are cults at heart: they survive by converting people. The religious denominations that have persisted have this conversion mechanic ingrained in them. In fact, when you have a state-sanctioned church they may in fact be less "cultlike" since they don't need mind-control / millieu-control mechanisms to coerce people to adhere to the group. So in "free" nations like America you get cult-like churches springing up, mormons, scientology etc, whereas the Anglican and Catholic churches don't have so much of the cultist stuff going on. Because, when you can't choose your religion they don't in fact need to brainwash you into not leaving. (however once Mormons build Salt Lake City they might have declined in the cult-like behaviour since they effectively became the state religion of the city. After that they completely dominate the public space so have less need for individual cult member control).