The belief that God doesn’t send people to hell, but that we send ourselves there, is exactly what mainstream Christianity believes (Catholicism, Orthodoxy, and many varieties of Protestantism). It’s mostly just Calvinists and fundamentalists who don’t believe that.
Look, I live in Italy, the country where Catholicism has its central base, and in all my life I’ve never heard anyone say that you send yourself to Hell thanks to your own guilt. I’ve always been taught that it’s God who decides who goes to Hell and who goes to Heaven, according to what the person has done in his life. Even during religion lessons at school (because yes, in Italy they teach religion at school), I have always been told that it’s God who decides that, not ourselves. Moreover, in the Book of Revelation it’s stated that at the end of time, it will be Jesus who will decide who can live in the Heavenly Jerusalem and who will have to perish in the Lake of Fire with Satan and his Demons. So, I’ve always assumed that mainstream Christianity teaches that it’s God who decides who deserves Heaven and who deserves Hell, not ourselves.