Answer 1
It was based on the original beliefs of Judaism and Christianity but now Judaism and Christianity have been changed by its followers thus making it untrue religions.
Answer 2
Yes. Answer 1 displays the Islamic perspective that Islam is a proper continuation of the monotheistic tradition, but Judaism and Christianity have deviated from that tradition to become something else. Historically, however, this view is not supported. The reverse is true. In fact, the Qur'an is a composite of several previously existing traditions (primarily Judaism and Christianity as extant while Mohammed was alive) that Mohammed merged and aggregated. Probably the most central basis of the Qur'an is Jewish tradition. This does not mean that the Qur'an lifted phrases only from the Bible, but rather that the Qur'an repeated stories or paraphrases of Jewish sources the commented on the Bible and that existed by 500 C.E. -- over 100 years prior to Qur'anic Revelation.
Some of these verses include:
In addition to the numerous Qur'anic verses that have origins in Jewish belief, the entire system of Islamic Jurisprudence (Fiqh) is modeled in the same manner as Rabbinic scholarship. Holy Texts are read and interpreted to give meaning and discretion to current situations and these are debated by jurists (Faqih) until such a time as an answer is created and a religious decision (fatwa) published. (Judaism is the same, but replace Fiqh with Oral Law, Faqih with Rabbi, and fatwa with responsum.)
Additional similarities between the religions include that both Judaism and Islam reject the Trinity as the Godhead, are based in orthopraxis (doing over believing), have a form of religious jurisprudence based on their holy books, have dietary restrictions, and pray in distinct holy languages at set intervals during the day.
Islam also takes a number of its views about Jesus from Early Christian heresies that dominated in Arabia at the time. The most prominent such view is that Jesus was not properly crucified. As recounted by Church Father Iranaeus in Against HeresiesChapter 24 - Doctrines of Saturninus and Basilides: Wherefore he [Jesus] did not himself suffer death, but Simon, a certain man of Cyrene, being compelled, bore the cross in his stead; so that this latter being transfigured by him, that he might be thought to be Jesus, was crucified, through ignorance and error, while Jesus himself received the form of Simon, and, standing by, laughed at them. For since he was an incorporeal power, and the Nous (mind) of the unborn father, he transfigured himself as he pleased, and thus ascended to him who had sent him, deriding them, inasmuch as he could not be laid hold of, and was invisible to all. Those, then, who know these things have been freed from the principalities who formed the world; so that it is not incumbent on us to confess him who was crucified, but him who came in the form of a man, and was thought to be crucified, and was called Jesus, and was sent by the Father.
Gnostic Christians, another Christian heretical sect held much the same view. Additionally, Q: 5:116 implies that the Christian Trinity is composed of the Father, the Son, and Mary (not the Holy Spirit). Although the Qur'an was put together between 610-632 CE, and the Nicene Creed of 325 CE already established the correct Christian Trinity, this misinterpretation makes sense when you take into account that several Christian heretical groups had the same Trinity. The Qur'an was responding to "local Christians" as opposed to all Christians. Many of the more mystial elements of the Jesus' life from Gnostics and other Heretical groups were also taken by the Qur'an and centralized.
Answer 3Christianity and Islam are both built on several concepts which they borrow from Judaism.
Jerusalem was built on the mountain of Moriah. It is a significant city in Judaism, Christianity, and Islam due to its historical and religious importance.
False. Christianity is based on the death of Jesus Christ as a suitable sacrifice for sin. Jesus is the saviour that Judaism looked for but they failed to see this. Islam recognises Jesus as a prophet but nothing more.
No, the Tower of Babel story is about a tower built in Babylon to reach the heavens. Jerusalem is a different city with its own historical and religious significance in Judaism, Christianity, and Islam.
Israel was the centre of Judaism and most people there were Jews and rejected the early Christians. Rome was the head of the Roman Empire and it was there that many Christians headed. It was the place that was ideal to start Christianity and to spread it from.
Probably the Buddhism and Christianity.
It was, in fact, not a break from the past. Jerusalem is still a sacred city for the Muslims. Islam is the continuation of Judaism and Christianity. The Muslims must believe in all the Prophets (May peace be upon them all). It was the secret wish of the Holy Prophet Hazrat Muhammad SAW that the House of Almighty Allah, built by Hazrat Abraham AS should become the Ka'abah for the Muslims. His wish was granted by Almighty Allah.
Jerusalem is considered the holiest city not only in Judaism and Christianity but also in Islam. It is believed that prophet Solomon built his temple (that was destroyed later on by the Romans) in Jerusalem. However, the city of Jerusalem is also central to Christianity where prophet Jesus was living. It is also central for Muslims as it was the first direction that they face during prayers and prophet Muhammad was raised to the Heavens (during the miracle of Israa and Mii'raaj) from Al-Masjid Al-Aqsa located in Jerusalem and returned back on the same night.
Judaism and Islam both have legal systems built into the religion: halakha and sharia, respectively. Christianity does have partial legal codices, but nothing as all encompassing as the religious legal systems of halakha or sharia.
Only, the Mosque (or Masjid in Arabic), for God worship per Islam religion, was firstly built in life of the Islam religion leader, Prophet Muhammad (PBUH), life. The first action done by prophet Muhammad (PBUH) after reaching Medina (or Al-Madinah) migrating from Mecca (or Makkah) was building the first mosque for God worship. Both the first temple for God worship per Judaism religion and the first church for God worship per Christianity religion were built after earth life of the prophets Moses and Jesus (PBU them) respectively.
They built the Vatican.
Cathedrals were built in the shape of a cross...