Muslims have the same concept and belief about being a martyr (jihad) as everyone, we just fully believe it in every aspect of life. Studying and becoming a functioning member of society is jihad, raising your kids to be good people is jihad etc. Jihad is the way of sacrifice. You cut off one thing to gain two more, whatever your beliefs are ofc, so this translated heavily into warefare. Spain and Portugal didn’t become Muslim lands for close to eight centuries just like that did they. I advise you to read more about Muslim warfare because some of the acts are bordering on suicide missions without context