I think you can clearly see that Quran is referring to Gospel ( Injeel) not New testaments - kind of common knowledge New testaments consist of text from Jesus disciples and Paul ; their letters and understanding . Even Luke, Matthew , Mark writers are anonymous . nobody actually know who wrote them ( yes there could be a portion of it which corelates to the actual Injeel) . Hence Muslims believe/ask to follow Bible which does not contradict with Quran/Hadith because its possible those are actual words of God
As far as nature of Jesus is concerned , Bible at many places state that Jesus is a Prophet , he never says to worship him and even says that he is send to lost sheep of Israelites - all of his disciples were Jews - Its Paul who opened it for Genital's - and added concept like Original Sin, Trinity , Salvation through faith in Jesus