Make up your mind!
I don't understand why some muslims beleive in the teachings of Christ and disregard other new testament books. If you want to believe that Jesus is just a good teacher and not the Son of God, even if that were the case then you would adhere to his teachings. And he clearly says that he is eternal. So how can you call Jesus just a good teacher and not follow his teachings? You cannot nitpick which scriptures to believe in, make up your mind, Jesus said,"no one can serve to masters, either he will cling on to one and despise the other."