Maharaji said specifically and directly that if you didn't have devotion to him you would go to hell in the Christmas, 1979 Satsang, which I believe you can see on EPO.  I actually have a hard copy of it from Divine Times.  So, it was even worse than saying it would happen if you didn't practice knowledge (which is what he "rotten vegetable" threat referred to), but that if you didn't have devotion to him.  Pretty extreme.