Colombia managed a decades long violent armed conflict with the same demographics. Organized crime, political instability, political ideologues, etc all can get people to kill each other without religious extremists.
Oh, the so called "extremists" are/were the ones with power. This is where it tops out. I know it's hard to see from a distance but you have no idea how bad can it get under the safe and sound status quo.
The indecision of the international community to act is what caused the suffering lasting a decade, led to the rise of ISIS and refugee crisis of enormous proportions.
Both of them were more moderate than ISIS lol.
But yeah, Egypt is more moderate than the Muslim brotherhood. Jordan is moderate. The non-Hezbollah part of Lebanon. UAE, Qatar, Oman all quite moderate. The Saudis are even secularizing a tad to try calming down fundamentalist sentiment. All these states actively suppress Islamism and generally are pro-west.
Most of the states I listed stayed on the right side of the US and US military equipment and aid keeps them stable.
Venezuela is Catholic and while it definitely has crime issues, there's no religious/fundamentalist element to the violence so the odds of anyone fighting to the death to support their failed dictator and his ideology is slim to none.