It is obvious that all Baha’i proselytizers haven’t been aware of the content of the holy Quran, basically. They may also pretend to be unaware based on the advice by the Baha’i leaders to God’s sheep. There are many verses in the holy Quran stressing the finality of the holy prophet (P.H.) which are as follows:
" تَبَارَكَ الَّذِي نَزَّلَ الْفُرْقَانَ عَلَى عَبْدِهِ لِيَكُونَ لِلْعَالَمِينَ نَذِيرًا" [فرقان/1]
“Blessed is He who hath revealed unto this slave the Criterion (of right and wrong), that he may be a warner to the peoples.” [Furqan/1]
"… وَأُوحِيَ إِلَيَّ هَذَا الْقُرْآنُ لِأُنْذِرَكُمْ بِهِ وَمَنْ بَلَغَ …" [انعام/19]
“And this Quran hath been inspired in me, that I may therewith you and whomsoever it may reach…” [Al-An’am/19]
" إِنْ هُوَ إِلَّا ذِكْرٌ لِلْعَالَمِينَ" [ص/87]
“Lo! It is naught else than a reminder for all people.” [Al-Sad/87]
" وَمَا أَرْسَلْنَاكَ إِلَّا كَافَّةً لِلنَّاسِ بَشِيرًا …" [سباء/ 28]
“And We have not sent thee (O’ Muhammad) save as a bringer of good tidings and a warner unto all mankind… “ n[Al-Saba/28]
1) The word "عالم" encompasses all world; but the word "عالمین" which is the plural from consists of all human beings according to Imam Sadeq (P.H.). the word "نذیر" consists of all human beings, too.
2) When the word "عالمین" has been used in a limited meaning, there is/are concept/concepts indicating limitation(s); such as, the verse:
" وَإِذْ قَالَتِ الْمَلَائِكَةُ يَا مَرْيَمُ إِنَّ اللَّهَ اصْطَفَاكِ وَطَهَّرَكِ وَاصْطَفَاكِ عَلَى نِسَاءِ الْعَالَمِينَ" [آل عمران/42]
“And when the angels said: O’ Mary! Lo! Allah hath chosen thee and made thee pure, and hath preferred the above (all) the women of creation.” [Al-Imran/42]
According to definite reasons, the Excellency Mary (peace be upon her) has been above all the women of her period of time. Additionally, the Excellency Zahra (peace be upon her) has been above all the women of all time. 
Consequently, no chronological or spatial limitation has been mentioned for the prophethood of the Excellency Muhammad (P.H.); the concept reveal no chronological and Spetial limitation. As the holy prophet (P.H.) stated in a sermon that:
"الا فیبلغ شاهدکُم غائبکُم لا نَبِیَّ بَعدِی و لا اُمَهَ بعدکُم ... "
“Lo! The present must inform the absent the no prophet will be after me and nor nation after you…”
4) The heavenly book of Quran has promised for the religion of Islam to be expanded all over the world. A promise which will be fulfilled when the Excellency Mahdi (May Allah hasten his reappearance) will be emerged. As Imam Sadeq (P.H.) stated to Mofassal after the following verse:
" هُوَ الَّذِي أَرْسَلَ رَسُولَهُ بِالْهُدَى وَدِينِ الْحَقِّ لِيُظْهِرَهُ عَلَى الدِّينِ كُلِّهِ …" [توبه/33]
“He is who hath sent His messenger with the guidance and the Religion of Truth, that He may cause it to prevail over all religion, however much the idolaters may be averse.” [Al-Taubah/33]
That: “Q’ Mofassal, if the prophet had dominated on all the religions, there wouldn’t have been any religions such as the Jewish, Christians or those who were worshipping stars, fire and also disunity, atheism and … . Allah has stated:
"... لِیُظْهِرَهُ علی الدین کُله ..."
“… that He may cause it to prevail over religions…”
is related to the day when the Excellency Mahdi (P.H.) will be emerged.” ;while the promised hasn’t been fulfilled.
 Fazel Mazandarani, Asrarul Athar, Bija: The national institute of the faith press, 128 Badi’a, Vol. 3, p. 164.
 Refer to: Ayatollah Jafar Sobhani, Finality based on the holy Quran, tradition and wisdom, translated by Reza Ostadi, Qom: The Lord of the Martyrs, 1369 S.H., p. 33.
 Ibn Al-Maqazi Al-Waseti, the virtues of the Household of the holy prophet (P.H.), The international forum for the proximity of religions, Bita, p. 474.
 The great scholars Majlesi, Behar Al-Anwar, searched by: AL-Seyyed Ibrahim Al-Miyanji, Muhammad Al-Baqer Al-Behboudi, Beirut: Darul Ehya Al-Torath, 1403 A.H., Vol. 2, pp. 381-382.
 Ibid, Vol. 53, p. 33.