You only truly fear that which can destroy you. More accurately, you only fear that which you believe can destroy you.
I'll use the example of the Crusades, because it's a good one. During the Middle Ages, Islam was what Rome had been before. The Arab world was the frontier of technology, philosophy, culture and society. Christendom (in this case, Europe) was decidedly not.
The leaders of the Catholic Church saw Islam as a threat to them. Serfs knowing about things like "another way of life" is bad for feudalism. Feudalism works as long as the people at the bottom believe they have no choice but to stay at the bottom. Another thing that helps feudalism is the belief that, after this life, there's a better one. People at the bottom of feudalism live, shall we say, rough lives. The promise of a better one later if they did what they were told made them do what they were told. Christianity promised such a thing. So did Islam.
The difference is that more Muslims could read, and they knew that their sacred book didn't say they could only get into heaven if they stayed in line and did what they were told. If many Europeans were to go to the Middle East, and see that there were people all over the place, not necessarily doing every last thing they were told, they might get it into their heads that maybe things could be like this back in Europe too. That would be bad for the Church, as they existed comfortably largely because people believed what they told them to believe.
In order to keep things under control, the church issued a statement saying "to kill an infidel is the path to Heaven." Most of the people in Europe (being only lightly sprinkled with education) said "what's an infidel?" After a brief pause, the Church pointed south-east and said "them!" With baited breath, the Church watched as all of Christendom prepared for war. Not until things were in full swing did they dare turn to each other and whisper "it worked!"
Anyway. That answers your question like this: conflict happens because the people at the top tell the people at the bottom that they ought to hate the people next door. The people at the bottom believe that the people at the top have their best interest at heart, so they don't think to hard before they start to hate the people next door.
So, the short answer to your short question is: lack of education. People don't (or can't) read their Bibles (or other holy books) for themselves. They take it for granted that The Bible says you should hate Muslims or that the Qo'ran says that you should hate Christians (when neither of them says any such thing) because that's what the guy who can read says it says. People don't know what the book says, so they listen to the guy who does. The guy who does has his own agenda.
Most religions are polytheistic, monotheistic, or particularistic. Some monotheistic religions are particularistic as are polytheistic. There are no religions that are all three.
I suppose your question is 'What are three monotheistic religions?' An answer would be: Christianity, Islam, and Judaism
JudaismChristianityIslam
Judaism.
Judaism, Christianity, and Islam.
The three major monotheistic religions are Judaism, Christianity, and Islam. These religions believe in one God and have sacred texts such as the Torah, the Bible, and the Quran.
define monothestic
Judaism, Christianity, Islam. The big three (lol), or the three monotheistic religions of the world.
All three major monotheistic religions could be said to share the same "God" because certain events surrounding that specific God overlap in religious stories. There is conflict because each religion celebrates Him differently and while Christians may believe their way is the right way, Muslims or Jews may believe differently or vice versa.
Monotheists are people or religions who believe in only one God. The three monotheistic religions are Judaism, Christianity and Islam.
Judaism (the original, not today's), Christianity (the original, not today's), and Islam...
Judaism, Christianity, and Islam.