I want more informations about Christianity.

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

Originally al-Nasraniya is the Divine religion revealed to Jesus Christ (blessings and peace of Allah be upon all His Prophets). Followers of this religion are called Nasara after the village of Nasirah in Palestine, where Jesus was born or they were called Nasara because they helped Jesus ().
Allah Says (interpretation of meaning): {… AlHawârîeen (the disciples) said: "We are Allâh's helpers" (i.e. we will strive in His Cause!). …} [61: 14].
In the late periods, the word "al-Nasraniya" was replaced by al-Masihiya (Christianity) and its followers were called al-Masihiyyoun (Christians) so that those followers can get rid of Muslim's hate to the first word (Nasara), that which was dispraised in the Qur'an and the Sunnah.
al-Nasraniya constitutes an extension of Judaism, since Jesus was sent to the children of Israel as a renewer of Moses' legislation and a corrector to what Jews altered in that legislation.
Allah Says (interpretation of meaning): {And He (Allâh) will teach him ['Iesa (Jesus)] the Book and Al-Hikmah (i.e. the Sunnah, the faultless speech of the Prophets, wisdom, etc.), (and) the Taurât (Torah) and the Injeel (Gospel). And will make him ['Iesa (Jesus)] a Messenger to the Children of Israel (saying): "I have come to you with a sign from your Lord, that I design for you out of clay, as it were, the figure of a bird, and breathe into it, and it becomes a bird by Allâh's Leave; and I heal him who was born blind, and the leper, and I bring the dead to life by Allâh's Leave. And I inform you of what you eat, and what you store in your houses. Surely, therein is a sign for you, if you believe.} [3: 48].
In a period of three centuries, Christianity lost the straight path, changed from monotheism to polytheism and deviated from what is right, since most the children of Israel accused Jesus of lying and denied his mission and changed their religion and book (Gospel).
After Allah, The Great and Almighty, raised Jesus , only a small number of Jesus' followers followed his right teachings and they were pursued by Jews. That state lasted for five hundred years. Then, it came the time of writing the distorted gospels that include opinions and views, which were not conveyed from Jesus and even some of them were from the Jewish interpolation. Thus, more than three centuries passed and the Christianity was under the great influence of pagan philosophy and rites as well as distortion, separation and dogmatic difference.
So, the original text of the gospel was lost, and many gospels came into existence, that made it impossible to have the true gospel.
After that, the king of Romans in Niqiya in 325 A.D. held a great Christian gathering whereas Christian innovators decided to make a new Christianity as a mixture of Roman paganism, distorted Judaism, mixed up Christianity and some of Indian paganism.
That gathering brought the creed of Trinity into existence: the father (Allah-Subhanahu Wata'alah) the son (Jesus) and the Holy Ghost (i.e. the spirit incarnated in Mary ). Therefore, we state that all Christians are disbelievers.
Allah Says (interpretation of meaning): {Surely, disbelievers are those who said: "Allâh is the third of the three (in a Trinity)." But there is no ilâh (god) (none who has the right to be worshipped) but One Ilâh (God -Allâh). …} [5: 73]. He also Says: {Surely, they have disbelieved who say: "Allâh is the Messiah ['Iesa (Jesus)], son of Maryam (Mary)." …} [5: 72].
In addition, we assure that all available gospels are not more than books of biography, since no one of them was written during the life of Jesus , although these gospels state that Jesus used to admonish by reciting the gospel. But, the revealed one is not available!?
No doubt an investigator can definitely recognize that words of the gospels are not Divine words, but a human work, since they are full of differences, errors and contradictions.
Allah Says (interpretation of meaning): {… Had it been from other than Allâh, they would surely have found therein much contradictions.} [4: 82].
Rahmatullah al-Hindi (a Muslim scholar) stated in his book: 'Izhar al-Haq: Bringing the right into view' that there are (1) 125 differences and contradictions in the Bible, (2) 110 errors, (3) 45 pieces of evidence that indicate commission in verbal distortion, and (4) 20 pieces of evidence that indicate omission in verbal distortion. It is sufficient to show their difference concerning the lineage of Jesus Christ (). Mathew traced back the ancestry of Jesus to Yusuf Ibn Jacob … to Sulaiman Ibn Dawood , while Luqa traced him back to Yusuf Ibn Hali … Nathan Ibn Dawood . Then, Mathew mentioned 27 fathers to Jesus , while Luqa mentioned 42. Also, they traced Jesus to Joseph the carpenter, and this constitutes the big lie that was fabricated by the Jews. It was their duty to trace him to his mother, Mary (Peace be upon her). And now can one believe that Mathew is infallible since he did not recognize Jesus' fathers. They also differed concerning the name of disciples: Luqa omitted Tadaws and replaced it with Yahuza (brother of Jacob ). Is it possible for one to believe in such Divine writings?!! (as claimed).
Another overt error, as recorded by Mathew , tells us about rising of some saints from their graves due to (false) crucifixion of Jesus , which is not mentioned in all other three gospels, although so many slight details were recorded in them.
A fourth marked error tells us that Doomsday will start with the presence of the generation that lived with Jesus . It is a fault that no Divine book should contain. Twenty centuries passed and such a prophecy did not come into being.
Luqa narrated that: The Lord will give him (Jesus) the chair of David , his father, and he will be their king forever… we say this is a big mistake!? Jesus was not a king of Jews or the family of Jacob . Does this mean that Allah's Promise will not come into existence?! Such narration and the like prove that the present gospels have no any relation with the gospel that was revealed to Jesus , and they are not a form of inspiration since they are full of mistakes and contradictions.
If those gospels were the true words of God, they would not include: (1) falsehoods about Noah , Lut , David and other Prophets, (2) confusion and contradiction about Trinity and crucifixion, that constitute their false religion, and (3) differences, contradictions and violations among Christian assemblies. In addition, Prophet Muhammad (Sallallahu Alaihi wa Sallam) was mentioned in their distorted gospels, but they did not believe in him as Allah's Messenger.
Studying history of the Christian assemblies proves that they accept only those who follow Roman paganism and fight those who believe in monotheism.
For more details, consult "Is the Bible God's Word" by Deedat and "Izhar al-Haq" by Rahmatullah al-Hindi.
Also, for more details in Arabic, consult:
1) al-Jawab al-Sahih, Ibn Taymiyah .
2) Hidayat al-Hayarah, Ibn al-Qayyim .
Allah knows best.