What does fighting in the cause of Allah mean?

Re: What does fighting in the cause of Allah mean?

This is close to what I understand however then it does not make sense that most of the muslim majority in the world keep cowering under the expression "Islam was spread by sword" and keep proposing theories and go all the way quoting quranic ayahs with tangential interpretations that Islam is a religion of peace. It is a religion in which peace prevails after the law of Allah has been established but there is no peace with those who do not accept the word of Allah and those we have to fight. It seems to me that muslims have lost their ability to prove that Islam is the message of Allah and in order to circumvent our disability we are riding under the banner that Islam was not spread by sword than rather be proud of those rulers who managed to spread it this far. The present day muslim countries have abandoned the quest for spreading Allahs religion and conceded defeat by giving their personal peace priority to the establishment of Allah law. Muslims have become so impotent that we are unable to group and fight to establish Allahs law and are embracing alternate theories imagining that we are saving face.