The doctrine of “Taqiyya”; does it allow Muslims to lie in order to spread and protect their faith?
The critics of Islam proclaim that Islam teaches Taqiyya that authorize Muslims to lie and manipulate in order to shield and expand their faith.
1. It is a known facts that the last and final messenger of God Almighty Prophet Muhammad was given the title of As-Sadiq (صادق ) and Al-Ameen (أمين) meaning truthful and the trustworthy by the people of Makkah. Even his bitterest enemies, including Abu Jahl acknowledge him as As-Sadiq and Al-Ameen. 
2. Warning not to tell a lie, even as a joke
Islam commanded truthfulness and forbade lying even as a Joke. Prophet Muhammad commanded not to speak a lie even to make people laugh.
Mu’awiyyah ibn Haydah reported: The Messenger of Allah, peace and blessings be upon him, said, “Woe to one who tells lies to make people laugh. Woe to him! Woe to him!” 
3. The Order to speak the Truth
Islam enjoins truth and forbids lying; and emphasizes observing truth and justice in every circumstance—even when testifying against oneself. 
4. The word Taqiyya does not appear even once in the Qur’an or sayings (Ahadith) of Prophet Muhammad.
5. It is a well know fact, even when faced with the most hostile circumstances in Makkah, Muslims did not hide their faith and continued to bear extreme persecution for twelve years. If Taqiyya were an Islamic injunction then this era would have been the best time to use it.
6. Islam instructs not to mix truth with falsehood neither conceal the truth while you know it. 
7. Observing truthfulness and justice even it is against yourselves or against parents and kindred. Whether he be rich or poor.
Qur’an says: “O you who have believed, be persistently standing firm in justice, witnesses for Allah, even if it be against yourselves or parents and relatives. Whether one is rich or poor, Allah is more worthy of both. So follow not inclination, lest you not be just. And if you distort [your testimony] or refuse [to give it], then indeed Allah is ever, with what you do, Acquainted.” 
8. Even Abu Sufyan, a then staunch enemy of Prophet Muhammad, could not relate to Heraclius Caesar a single oath Prophet Muhammad ever violated.
9. Prophet Muhammad said, “If someone swears a false oath near this pulpit of mine, he will take his seat in the Fire.” 
10. Prophet Muhammad said, “Shall I inform you about the greatest of major sins? They are three: to associate partners with God Almighty, to disobey your parents, and to bear false witness (or he said) to speak falsely.”  The Holy Qur’an corroborates the essence of these statements. 
Thus, these, and numerous other ayat of Qur’an and saying of Prophet Muhammad, demonstrate beyond a shadow of a doubt that lying has no refuge in Islam.
 Dala’il al-Nabuwwah, Baihaqi, Dar al-Kutub al-‘Ilmiyya, Beirut, Lebanon
 Sunan Abī Dāwūd 4990
 Qur’an 2:10-20; 4:69, 135; 5:8; 9:119; 33:35; 61:2-3.
 Qur’an 2:42.
 Qur’an 4:135  Muwatta, Book 8.
 Muslim, Book 1.