Difference between Islam and Christianity

Q 1: What is the difference between Islam and Christianity?

A: Islam is the religion of monotheism, with which Allah (Exalted be He) sent Prophet Muhammad (peace be upon him). Allah (Glorified be He) has made it obligatory for the Jinn (creatures created from fire) and the human beings to embrace Islam. Allah (Exalted be He) says, And whoever seeks a religion other than Islâm, it will never be accepted of him, and in the Hereafter he will be one of the losers. Christianity is principally the religion with which Allah (Exalted be He) sent His prophet and messenger `Isa (Jesus) (peace be upon him). It is principally a call to monotheism to which all the prophets and messengers called, but the Christians distorted their religion and joined other deities with Allah (Exalted be He) and claimed that Allah (Exalted be He) has a wife and a child, Allah is Exalted above such things. Allah (Exalted be He) says, And (remember) when Allâh will say (on the Day of Resurrection): "O ‘Isâ (Jesus), son of Maryam (Mary)! Did you say unto men: ‘Worship me and my mother as two gods besides Allâh?’ " He will say: "Glory be to You! It was not for me to say what I had no right (to say). Had I said such a thing, You would surely have known it. You know what is in my inner-self though I do not know what is in Yours; truly, You, only You, are the All-Knower of all that is hidden (and unseen). Never did I say to them aught except what You (Allâh) did command me to say: ‘Worship Allâh, my Lord and your Lord.’ When Allah (Exalted be He) sent Muhammad (peace be upon him) with the religion of Islam, He ordered everyone to follow the new religion as it abrogates all those that preceded it, so anyone who does not follow it is a Kafir (disbeliever) (Part No. 1; Page No. 39) in Allah (Glorified and Exalted be He). In Surah Al-A`raf, Allah (Exalted be He) says, Say (O Muhammad صلى الله عليه وسلم): "O mankind! Verily, I am sent to you all as the Messenger of Allâh - to Whom belongs the dominion of the heavens and the earth. Lâ ilâha illa Huwa (none has the right to be worshipped but He). It is He Who gives life and causes death. So believe in Allâh and His Messenger (Muhammad صلى الله عليه وسلم), the Prophet who can neither read nor write (i.e. Muhammad صلى الله عليه وسلم), who believes in Allâh and His Words [(this Qur’ân), the Taurât (Torah) and the Injeel (Gospel) and also Allâh’s Word: "Be!" - and he was, i.e. ‘Isâ (Jesus) son of Maryam (Mary), عليهما السلام], and follow him so that you may be guided." He (Exalted be He) also says, And We have not sent you (O Muhammad صلى الله عليه وسلم) except as a giver of glad tidings and a warner to all mankind. Allah (Exalted be He) says, And We have sent you (O Muhammad صلى الله عليه وسلم): not but as mercy for the ‘Alamîn (mankind, jinn and all that exists). He (Exalted be He) also says, Truly, the religion with Allâh is Islâm. Allah (Exalted be He) says, And whoever seeks a religion other than Islâm, it will never be accepted of him, and in the Hereafter he will be one of the losers. He (Exalted be He) also says, This day, I have perfected your religion for you, completed My Favour upon you, and have chosen for you Islâm as your religion.