You know, it's the position of a certain denomination that while Jesus is a certain path to salvation, it's not necessarily the case that Jesus is the only path to salvation. That particular denomination is the Roman Catholic church. In addition, encyclicals like Redemptoris Missio are very friendly to the theology of universal salvation (i.e. everyone goes to heaven), and Pope John Paul II was noted for his benevolence toward the concept.

So while it's a very easy and comfortable claim to make that all Christians believe that you must accept Jesus as Your Personal Lord and Savior™ or else you get a one-way ticket to Brimstone Resorts for the next eternity, it's not a correct one. It is quite possibly the case that most Christians do not believe that doctrine; it is for a fact not the official doctrine of the single largest denomination of Christianity, and Orthodoxy tends to have equally nuanced views of soteriology. People preaching fire and brimstone in the 21st century is a largely Protestant thing.