Just because a European country benefits from a democratic system where church and state are separate doesn’t mean this model can be supported and effective in areas that may have ethnic or cultural disparity. Such places may need some form of unifying factor to quash arguments and violence.
An example of this may be Jordan where the government and royal family proclaim the importance of religious tolerance, with Christians being especially well integrated, and holding positions in government as high as deputy prime minister. Despite some discrimination in society, Jordan’s Muslim majority and Christian minority remain generally peaceful, despite the widespread turmoil in this region. Arguably this may not be possible without the control of the king, as despite Jordan being a constitutional monarchy, King Abdullah II enjoys wide executive and legislative powers and has considerable influence over the country.
Likewise, if countries are going to exercise democracy, and the popular opinion is a religious one, it is likely that more overtly religious conservatives get voted into positions of power. An arguable example of such is in Egypt, following the Arab spring people speculated that a secular government would take power but increasingly religious and conservative parties were repeatedly voted in. Different areas and people groups have different outlooks and perspectives, and democracy will mirror this.