The single most important commandment in Judaism and Christianity is the belief in the one god Yahweh (and in Jesus as his son, for Christians), and to have no other gods. Denying the Holy Spirit (aka not believing in Yahweh) is said to be the one unforgivable sin in Christianity.
So according to Christianity, Mohandas Gandhi is currently being burned and tortured in hell, where he will remain for all of eternity, but if a genocidal tyrant has a deathbed conversion and accepts Jesus into his heart, they go to heaven.
It so happens that there is no good reason or evidence to justify belief in god or religion, souls or the afterlife. But even if it were true, could you really bring yourself to worship such an irrationally evil celestial dictator? If you could, it would be out of fear and terror, not love and respect.