Is liberal Christianity still Christianity?

It’s becoming more and more common among liberal Christians to believe that hell is not the ultimate destination for all people that haven’t been washed in the blood of the lamb. As far as I’m concerned it’s win for religious tolerance. However, the way I was raised the defining feature of Christianity was that the purpose of Jesus’ coming was to be crucified and that it was his sacrifice that was going to get your ass out of the fire. But if avoiding hellfire was as simple as having a good heart or doing good deeds or not being a complete douche doesn’t that strip the crucifixion of it’s theological significance and make Christ’s sacrifice a pointless act of violence?