Luke 12.4-7Who is this one whom we must fear because he, she or it "has authority to throw you into hell"?
I tell you, my friends, do not be afraid of those who kill the body and after that can do no more. But I will show you whom you should fear: Fear him who, after your body has been killed, has authority to throw you into hell. Yes, I tell you, fear him. Are not five sparrows sold for two pennies? Yet not one of them is forgotten by God. Indeed, the very hairs of your head are all numbered. Don’t be afraid; you are worth more than many sparrows.
Most people think this is a reference to God. Fear God because God can throw you into hell.
But might this be a reference to someone other than God?
That is N.T. Wright's argument in Jesus and the Victory of God where Wright argues that this is a reference to Satan rather than God (pp. 454-455):
Some have seen 'the one who can cast into Gehenna' as YHWH; but this is unrealistic. Jesus did not, to be sure, perceive Israel's god as a kindly liberal godfather who would never hurt a fly, let alone send anyone to Gehenna. But again and again--not least in the very next verse of this paragraph--Israel's god is portrayed as the creator and sustainer, one who can be lovingly trusted in all circumstance, not one who waits with a large stick to beat anyone who steps out of line. Rather, here we have a redefinition of the battle in terms of the identification of the real enemy. The one who can kill the body is the imagined enemy, Rome. Who then is the real enemy? Surely not Israel's own god. The real enemy is the accuser, the satan.