unity

Summary

Today, the world of Islam is facing many problems. Islam has placed great emphasis on the unity, unanimity and brotherhood of Muslims. We can hold fast by the rope that Allah stretches out individually, but Islam does not advise this: "And hold fast, all together, by the rope which Allah stretches out for you" [The Holy Quran, 3: 103].

Summary

However all Muslims have a common enemy and they have common culture one of them monotheism and prophet Mohammad (pbu) and holy Quran of course they should know each other to overcome the historical prejudices that prevent objective understanding between people and to build upon commonalities.
Imam Ali (pbu) said people are enemies of what they do not know.

Muslims  have a commonality with some branches of religion. Thus, among the followers of the various religions, Muslims are more deserving of having unity, and thus the possibility of scientific, cultural, political and other interactions among them is stronger. Muslims also have a commonality with some branches of religion. Thus, among the followers of the various religions, Muslims are more deserving of having unity.

He has prescribed for you the religion which He had enjoined upon Noah and which We have [also] revealed to you, and which We had enjoined upon Abraham, Moses and Jesus, declaring, ‘Maintain the religion, and do not be divided in it.