In that very same chapter of John our Lord also says,
Jhn 6:38 For I have come down from heaven, not to do my own will but the will of him who sent me.
Jhn 6:39 And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day.
Jhn 6:44 No one can come to me unless the Father who sent me draws him. And I will raise him up on the last day.
God will never cast us out but we can by refusing to love God and rebelling by choosing our sins over him.
Again, I notice here the Protestant tactic of completely ignoring those verses that contradict their a priori dogmas based on human tradition.