Why is it so impossible for Muslims to coexist peacefully with Christians? Because Islam is threatened by Christianity. Muslims know that the only reason Islam continues to exist is because it holds its slaves in fear, fear that to leave Islam is to invite the death penalty. Islam keeps its slaves ignorant, feeding them from birth a diet of lies and twisted truths, teaching them to hate others- people who have little animosity towards Muslims. Islam prevents its slaves from accessing the beliefs of Christianity, banning and disparaging the study of Bibles, for fear that the truth would expose the lie of Islam. Islam hates non-Muslims and seeks to persecute them, to demonstrate to the Muslim masses that you cannot be a non-Muslim and be happy, lest the vast multitude of lip-service Muslims simply leave Islam.
If Islam adopted a more tolerant attitude, allowed people to worship their God as their conscience dictated without interference, promoted peace and recognized the brotherhood of man, acknowledged that a man's relationship with God is a personal matter between him and God alone, practiced that no person should be coerced to worship in a particular fashion. . . why inside of generation, Islam would virtually disappear from the face of the Earth!
Even with all of the totalitarian guards that Islam has erected to defend its ignorant theology, it is doomed, because you cannot keep the truth from so many people forever. As more people see the truth and turn away from Islam, it will scream louder, become more strident, its lies will become more outrageous, and it will lash out in frustration at the enemy that seduces its faithful away with truth. Instead of melting quietly away as it should, it will self-destruct in a paroxysm of violence, as Satan seeks to harvest his crop of souls before they return to the path of truth. We see that starting today.
How can the truth be defeated? If the Muslim believes that Islam is the truth, they should put down their weapons and embrace the non-Muslim, the Jew. Their truth will protect them and their beliefs. They should be able to persuade the infidel to become a Muslim without fighting them or subduing them. They should be able to prevent the apostate from leaving Islam by simply stating the truth to them. Since Islam must constantly attack the infidel, since it must kill those who leave Islam, this demonstrates that their ideology is bankrupt, their truth is a sham, and that they must gain through violence and force what they cannot possibly do through reason.