Answer: According to the holy Quran Jesus Christ (P.H.) is alive, first. Second, he will surely come to be the companion of Imam of the time (May Allah hasten his reappearance) – but not as a new prophet.
One of the proselytizing Baha’i networks claimed: “Shiites say Jesus Christ will appear after the Excellency Mahdi’s (P.H.) emergence while they had said before that revelation has been interjected by the emergence of the holy prophet (P.H.)! [The telegram network of Baha’ism]. To answer this doubt we will mention the following notes:
1) The holy Quran who is considered as a right and heavenly book declares that the Jesus Christ (P.H.) is alive:
وَ قَوْلِهِم اِنّا قَتَلْنا المَسیحَ عِیسی ابْنَ مَرْیَمَ رَسُولَ اللهِ وَ ما قَتَلُوهُ وَ ما صَلَبوُهُ وَ لکِن شُبَّهَ لَهُمْ وَ اِنَّ الَّذینَ اخْتَلَفُوا فیهِ لَفِی شَکٍّ مِنْهُ ما لَهُمْ بِهِ مِنْ عِلْم الاّ اتِّباعَ الظَّنَّ وَ ما قَتَلوُهُ یَقیناً
And because of their saying: We slew the Messiah Jesus son of Mary, Allah’s messenger They slew him not nor crucified, but it appeared so unto them; and lo! Those who disagree concerning it are in doubt thereof; they have no knowledge thereof save pursuit of a conjecture; they slew him not for certain, [Nisa, 157]
2) According to Shiite and Sunni traditions, the Jesus Christ (P.H.) will be emerged as the companion of the Excellency Mahdi (P.H.). He will pray after him and help…
Consequently, Shiites believe that the Excellency Jesus (P.H.) will be emerged as the companion of Imam Mahdi (P.H.) not as a prophet who will abolish the religion of Islam.
 Bokhari, Sahih Bokhari, Masdarul Ketab: endowment ministry of Egypt, Hadith No, 3449. Esbatul Hodat Bennusousel Wal Mo’ajezat, Beirut, A’alami, 1425 A.H. Vol. 5, p. 227.