Not at all! God is true, even though every human being is a liar. It is written, "You are right when you sentence me. You are fair when you judge me." --(Psalm 51:4)
Doesn't the fact that we are wrong prove more clearly that God is right? Then what can we say? Can we say that God is not fair when he brings his anger down on us? As you can tell, I am just using human ways of thinking.
Someone might argue, "When I lie, it becomes clearer that God is truthful. It makes his glory shine more brightly. Why then does he find me guilty of sin?"
Why not say, "Let's do evil things so that good things will happen"? Some people actually lie by reporting that this is what we say. They are the ones who should be found guilty.
"Their throats are like open graves. With their tongues they tell lies." --(Psalm 5:9) "The words from their lips are like the poison of a snake." --(Psalm 140:3)
We are made right with God by putting our faith in Jesus Christ. That happens to all who believe. It is no different for the Jews than for anyone else.
God gave him as a sacrifice to pay for sins. So he forgives the sins of those who have faith in his blood. God did all of that to prove that he is fair. Because of his mercy he did not punish people for the sins they had committed before Jesus died for them.
There is only one God. When those who are circumcised believe in him, he makes them right with himself. When those who are not circumcised believe in him, he also makes them right with himself.