1. Holy Land is an important location for all three monotheistic religions. For the Jews, that is, Judaism, it represents the promised land, the place where the first Jewish temple (Jerusalem) is built, as well as the belief that God placed the cornerstone of wisdom in Zion, a hill near Jerusalem, which is why the advocates of the idea of returning the Jews to Israel after another World War II is called Zionists. For Christians, it is also the Holy Land, because Jesus Christ was born, preached, and was crucified right here. In Jerusalem and around it are the most sacred churches in the world, the church of Christ's birth in Bethlehem, and the Church of Christ's grave near Jerusalem. For the Muslims, Jerusalem, or more precisely the Temple Mount, is the place from where Mohammed rose to the heavens, and the third most sacred place in the world, after Mecca and Medina.
The Holy Book of Judaism is the Old Testament, which encompasses Torah, prophets, preachings, and the sayings of the wise. It is compared with other texts, above all, with the Christian New Testament, after the fulfillment of what was said in the Old Testament. Many records of the Old Testament are quoted in the New Testament as references that are filled with the coming of Christ. The same prophets are mentioned in both the Testaments, the promises of God, the Ten Commandments. The Holy Quran Muslim Book is differently conceived, but in essence it can be compared with the other two Holy Books, according to God's promises given to the righteous, punishment for sins, even the second coming of Christ, though only as a prophet with all the other prophets of God, Muhammad, Moses, etc.
Within each religion there are differences and divisions. Perhaps there are fewer ones in Judaism, they are mostly compact and given the importance of rabbis as teachers and religious leaders, resulting from the millennia exile and the need to be a complex community. Perhaps differences should be sought in the way the scholars interpret the Old Testament, which results in countless interpretations, which are contained in the Talmuds. For Christianity, there is the highest divisions, above all, of the Catholic and Orthodox Church. The first difference between these two churches is whether the Holy Spirit comes only from the Father, according to the claim of the Eastern Church, or from the Father and the Son, according to the Western Church. Then the Protestantism, and then countless separations that have led to the fact that there are many ways of interpreting Christ's teachings and Churches, which can lead to confusion. Of course, human freedoms when interferences are in question are present.
Muslims are also divided into Sunit and Shia. The basic differences between these two groups is the way of interpreting how to choose a religious leader, whether as a successor of Muhammad and his relatives, or it can be anybody.
Similarities in the belief of all three religions is that God is one, that there is Paradise and Hell, that people, according to the merits of this world, go to Paradise or Hell. The likeness of Judaism and Islam is circumcision, not eating a particular kind of meat, nor drinking drinks from the boiling process.
The difference is that for the Jews, Christ is not the son of God, that the Messiah is yet to come, while for the Christians while, he has already walked the earth as the Messiah and will come again. The difference between Christianity and Islam is that Christians worship the Holy Trinity, that according to the Muslims, Christ was only a prophet and not a son of God. The differences between Christians and the other two religions, which in Christianity has no restriction in terms of food and drink, except for fasting.
2. In my opinion, all three religions are more similar than they are, if we consider primarily the original teachings, and not their extreme versions. In all three religions, hospitality is primary, the example of Abraham in the Old Testament, the Christian doctrine of hospitality, and the acceptance of strangers and travelers in Islam. All three faiths are basically peaceful, positive and upbuilding, if we exclude extreme cases in all three, which when they become such, are no longer part of religion.