You are not reading the word of God in Scripture. Scripture says that God created this race out of Abraham to use to show us who He is. Scripture says that the way to salvation is through Christ. They talk of the Messiah, are still looking for Him and most do not recognize Christ as the true Messiah. We are to recognize that they are doing this in error, but scripture predicted they would and also tells us God will take care of it. Scripture even tells us God is using this to help us see the way to salvation.
In the last days, scripture says, we will see that God made them His chosen people and we will go back to following them. If we follow them, I feel sure God will see to that they will recognize the Messiah in the Christ who died for our sins. As it is, it is wrong for us not to follow them in knowing our Father God, the Father of the Messiah who died for our sins. We pray to "Our Father who is in heaven" yet put the Son who the Father gave for us ahead of the Father they know of. They are in grave, serious error. We are to see their error, but not be blind to the good because we see it. They are not denying a Messiah, they are denying that the Messiah was the man who lived in about the year 30, and all we know about. We are told to pray for them. We haven't been instructed to pray for the people determined to give theirselves to idol worship, just to be sure they are told of the One True God.
Scripture talks about false Gods and following them. There is no similarity at ALL beween the God of the jews, who is the same God as Christ talks of as His FATHER, and the God the Muslims have created who is man made.
As far as denying Christ, I wonder at how the Jews stick so to this and conclude it is part of God's plan and I am to let it alone in my mind. I follow scripture in Romans to conclude this. But to deny the Jews their faith in the very same God we have, the one they pray to with the very same prayer we use, is sacrilege. Before the time that Christ lived with us as a man, they were using a prayer we call the amidah. If you compare this prayer to the one Christ told us to sample out prayers after, you will see it is a longer version of our prayer.