Why are muslims afraid of being corrected in their Flawed concept of Trinity?

Muslims are to belive in the bible but unfortunatley it was modified by men, hecne we ar enot to belive in that. Porphet Muhammad (saw) came as the last messenger and revealed the quran. the quran is yet to be modified by men. when this happens the last ays will come. proof that the quran is true:www.miraclesofthequran.com