Your comparisons are a bit strange. Somehow, I suspect your grandmother was not threatening you with eternal torment (and eternal torment for all your offspring), if you had misbehaved.
Otherwise, I just found it surprising that you would admit your belief in gods are capricious and subject to mere happenstance.
Of course I was never threatened with eternal torment, etc. at home, in church, or in religion class. What kind of religion/people did you grow up with? God is not capricious. He reaches out to all. He cares deeply about us. That does not mean He carefully wraps us in cotton batting and places us carefully out of harms way. It means He cares about all we are going through.
He would care about me whether I was Hindu, Buddhist, Jew, Muslim, Christian, atheist...because that is who God is. This is not a difficult concept to understand. The Catholic catechism puts it like this: The Church teaches the Way Jesus taught because that is all it has the authority to teach. If someone wishes to be Hindu, Jew, Muslim, etc., it won't do them any good to become Catholic. The Church only knows one way. Every other way is left to the love and mercy of God, our Father/Creator. And God's hands are very good hands to be in. Catholicism is the way for me. Atheism, Judaism, Buddhism, Protestant Christianity are the ways of other close family members and it all seems to work great for them as well.