You shall fight for the cause of God; you are responsible only for your own soul, and exhort the believers to do the same. God will neutralize the power of those who disbelieve. God is much more powerful, and much more effective.
فَقٰتِل فى سَبيلِ اللَّهِ لا تُكَلَّفُ إِلّا نَفسَكَ وَحَرِّضِ المُؤمِنينَ عَسَى اللَّهُ أَن يَكُفَّ بَأسَ الَّذينَ كَفَروا وَاللَّهُ أَشَدُّ بَأسًا وَأَشَدُّ تَنكيلًا
faqaatil fee sabeelil laahi laa tukallafu illa nafsaka wa harridil mu’mineen; ‘asallaahu ai yakuffa ba’sallazeena kafaroo; wallaahu ashaddu ba’sanw wa ashaaddu tankeelaa