There is no clear instruction in the Quran to pray 5 times a day - that is based on interpretation and what Prophet Mohamed is believed to have practised.
A lot of Shia Muslims pray 3 times a day.
Muslims don't all act the same way - some will be more observant than others of rules e.g. about avoiding intoxicants, or avoiding paying or receiving interest, or avoiding gambling.... or avoiding murdering people.
Some members of a Muslim community who feel they have been oppressed and driven from their homes may unilaterally declare war on their perceived oppressors, while others might think this is a decision to be made only by the leader of that Muslim community, as was done (according to my understanding of Quranic verses) in the time of Prophet Mohamed against the tribes who had expelled the Muslims from Mecca and tried to kill Prophet Mohamed, forcing him to flee and set up a community elsewhere. The Quran talks about fighting those who fight you, but if the enemy inclines to peace, Muslims should also incline towards peace. As NS said, the verses in the Quran also have to be looked at in the context of the events believed to be taking place at the time the verses were revealed.
I have no idea how many Muslims today feel they have been attacked and feel they need to fight back, but haven't noticed a large Muslim army on the attack - IS numbers fighting in the ME are in the thousands, but estimates have ranged from 31,500 to 200,000 depending on who you ask (and who knows if the person making the estimate has a WMD type agenda). That still isn't much for a post-invasion civil war, in an area where there is sectarianism, corruption, and lots of young unemployed men with access to weapons that were abandoned by the Iraqi army, and access to cash from oil sales to buy more weapons and pay more fighters, out of the millions of Muslims in that very volatile region and the billion Muslims world-wide.
