It’s important to remember that Jesus’ heart & motive is always for people to experience freedom from any bondage they are in. And he’s willing to go to great lengths for that to happen. In John 8:31-47, Jesus speaks to those who once believed but no longer do. And he takes a hard line with them & he does not back off even though he knows it’s uncomfortable for them. Freedom from bondage is his goal. How does he try to help them to see that they are in fact in bondage? He gives them a paternity test. Who is their real father? They cling to Abraham as Jesus challenges them. Having been rebutted quite easily by Jesus, they then switch to God. Jesus uses their own actions over & over to prove that neither Abraham nor God was their father. Based on their holding to falsehood and wanting to kill Jesus, the only father they line up with is the devil.