Rumi gave the answer that removes most of the problems you have addressed, namely going back to the Quran and using it as the sole arbitrator of our differences. The various sects and political parties have manmade ideas that result in the “us and them”, which leads to the ultimate tragedy for humanity of regarding someone as unworthy of their Allah given life.
Dr Saab has repeatedly used words like “the Quran teaches us that our role is to do that which benefits humanity”; how does this equate to suicide bombing, apostate murder, hating someone because of their tribal ancestry, political or religious persuasion, etc. etc.etc.?
Go back to the Quran and the majority of the problems disappear. This can only be achieved by educating the people about the Quran and when this is done we will have people able to reason and think about the problems we face, rather than the shoot first, think later way of living we seem to be in now [murder first, jannah later!!!!!!!]. The majority do not know enough of the Quran and this allows the ignoramuses’ to rule the psychiatric asylum we call planet earth.
2:213 Mankind were one single community (but selfishness divided them). So, God sent Prophets as bearers of good news and warnings. He sent down with them the scripture in absolute truth that it might judge between people wherein they differed. But again, out of mutual rivalry, they divided themselves after all evidence of the Right had come to them! So, God shows the lighted road to those who would acknowledge the truth and thus resolve their disputes. And God guides to the straight road him who wills to be guided.
[Satan, the selfish desires, had rent asunder the unity of mankind. 2:36, 10:19. Using the perceptual and conceptual faculties in all humility help people achieve guidance, while selfishness, arrogance and blind following lead them astray. 2:170, 4:88, 6:56, 7:173, 7:179, 17:36, 27:80-81, 30:22, 37:113, 40:34-35, 41:17, 56:79]
2:214 Or, do you expect to enter the Garden (or regain your lost Paradise) without facing challenges as came to those who passed before you? Hardship and adversity befell them, and so shaken were they that the Messenger and the believers with him, cried, “When will the help of God come?” But, (once the revolution gets going) God‟s help is near.
[3:141, 9:16, 29:2, 33:10. Unity of mankind will not be easy to attain. The differences and prejudices of race, ethnicity, color, creed, wealth and nationalism will always be the barriers to surmount]