The linked article below quotes the International Islamic Conference for Dialogue that wrote, "Coexistence and cooperation do not mean concessions regarding the fundamental principles nor harmonising among religions." Well, that's a fundamental error.
Look, there are two ways to go concerning the religions of the world. You can pretend that the above quote presents the right philosophy, or you can be honest that some religions are based upon coercion and ultimately violence that is diametrically opposed to coexistence and cooperation.
Islam for instance came directly from Mohammed who clearly taught, as documented in the Qur'an, that so long as Islam dominates then Muslims can tolerate other religions. Where Islam doesn't dominate, according to Mohammed, it is the duty of the Muslims to subjugate the people. If you change that principle, you don't have Islam anymore. You don't have the teachings of its founder. You have something else.
Likewise for Judaism, it came directly from Moses who clearly taught, as documented in the Torah, that all the land between the rivers belongs to the Jews provided those Jews exterminate other peoples. "But thou shalt utterly destroy them; namely, the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites; as the LORD thy God hath commanded thee" Deuteronomy 20:17. If you change this, you don't have the Mosaic Law anymore. You don't have Judaism as the Torah-believing Jews claim the name "Judaism." They didn't do it though. They left many alive.
Now, of the three, only the tenets of real Christianity oppose violence all the time. Only real Christianity will leave the others to their religions to fall of their own errors. Christianity only warns, and then it lets things be.
How then may these religions live together? Where Islam and Judaism (so-called) dominate, they fear the Gospels. They won't let it be preached openly. Many Jews say they fear a reprising of the violent reactions of those who called themselves Christians (but were not). Why though do those Jews fear the Gospel of non-violence?
Well, the answer is plain. They don't want the heads of their fellows turned from violence to non-violence, because without enough fellows, their plan to possess the land is forever thwarted.
The fact is that only non-violent religion can live peacefully on the Earth, and that's not the fault of the non-violent but the violent.
Leading clerics urge Muslims to learn about other faiths in drive to promote harmony
Riazat Butt in Mecca
The Guardian, Saturday June 7 2008 Article history
An international appeal was launched yesterday urging Muslims around the world to learn about non-Muslims and their cultures for the sake of peaceful coexistence.
The call was made in a communique issued at the end of the International Islamic Conference for Dialogue, a three-day event that brought together more than 600 influential scholars and academics.
The plea, one of many in the 18-page document, aimed to encourage Muslims to reach out to people from other monotheistic faiths in order to diffuse conflict and restore tolerance. The appeal was careful to make the distinction between integration and assimilation: "Coexistence and cooperation do not mean concessions regarding the fundamental principles nor harmonising among religions."
The initiative has the support of the Saudi monarch King Abdullah....
There were signs that dialogue with other believers, specifically Jews, would be problematic. Several clerics, including the grand mufti of Saudi Arabia, said it was almost impossible to talk to them because of the situation in the occupied territories. "How can you negotiate with someone who is against you all the time? They seem to be against us in every way so I don't know how we're supposed to have dialogue."
Egyptian cleric Yusuf al-Qaradawi said he would only talk to Jews who denounced Zionism and he urged Muslims to talk to Buddhists, Hindus and atheists. His impromptu speech, lasting 15 minutes, garnered the loudest applause, proving his popularity among fellow clerics even if the west views him with suspicion.