Believing what you want to believe is one thing, but trying to tear down the belief systems of other people and claiming your own is superior is pretty arrogant.
Certain varieties of "Christians" just KNOW so many things with certainty (e.g. their FAITH), and would have the hand of government impose their beliefs on the rest of our society.
An example was Prohibition.
Certain varieties of muslims similarly know many things with certainty, and have empowered some governments, to impose those beliefs on the rest of societies.
An example is prohibition of alcohol.
To demonstrate their enlightenment, the muslims also punish the victims of rapes, by killing the females, to name a choice example.
Literal interpretations of the Bible or Koran are the basis of the conflicts, and using that as a basis for civil laws.