Yes but civil wars are not as common and are a relatively new invention. In that case religion is not a significant factor in deciding the outcome.
Despite claims of the envious left, religion is not usually the root cause of murder, looting, destruction, and war. Envy is. Religion helps win at war. Muslims envy and therefore hate the West. Their envy is not because of their religion. All sound religions insist that envy is an unacceptable practice, and for good reasons.
We’ve been having civil wars since there were rulers.
What was the root cause of all that happened during the Great Schism, the 30yrs war, the French wars of religion or the Protestant Reformation?