I can go kill the unbeliever of Islam because the Koran says I can. I am being a good Muslim.
I can kill in the name of Jesus but the Gospel say I can't. I am being a bad Christian.
That's the difference.
Q4:95 “Allah hath granted a grade higher to those who strive and fight with their goods and persons
than to those who sit (at home).”
Q8:60 “to strike terror into (the hearts of) the enemies, of Allah and your enemies, and others besides,
whom ye may not know, but whom Allah doth know.”
Q9:29 “Fight those who believe not in Allah nor the Last Day, nor hold that forbidden which hath been
forbidden by Allah and His Messenger, nor acknowledge the religion of Truth, (even if they are) of the
People of the Book, until they pay the Jizya with willing submission, and feel themselves subdued.”
Matthew 5 "But I say unto you, Love your enemies, bless them that curse you, do good to them that hate
you, and pray for them which despitefully use you, and persecute you"
Joel 3:9:
Proclaim this among the nations: Prepare for war! Rouse the warriors! Let all the fighting men draw near and attack.
Matthew 24:6:
You will hear of wars and rumors of wars, but see to it that you are not alarmed. Such things must happen, but the end is still to come.
Romans 13:4:
For the one in authority is God’s servant for your good. But if you do wrong, be afraid, for rulers do not bear the sword for no reason. They are God’s servants, agents of wrath to bring punishment on the wrongdoer.
Deuteronomy 20:1-4:
1 When you go to war against your enemies and see horses and chariots and an army greater than yours, do not be afraid of them, because the LORD your God, who brought you up out of Egypt, will be with you.
2 When you are about to go into battle, the priest shall come forward and address the army.
3 He shall say: “Hear, Israel: Today you are going into battle against your enemies. Do not be fainthearted or afraid; do not panic or be terrified by them.
4 For the LORD your God is the one who goes with you to fight for you against your enemies to give you victory.”
Psalm 144:
1 Praise be to the LORD my Rock, who trains my hands for war, my fingers for battle.
2 He is my loving God and my fortress, my stronghold and my deliverer, my shield, in whom I take refuge, who subdues peoples under me.
3 LORD, what are human beings that you care for them, mere mortals that you think of them?
4 They are like a breath; their days are like a fleeting shadow.
5 Part your heavens, LORD, and come down; touch the mountains, so that they smoke.
6 Send forth lightning and scatter the enemy; shoot your arrows and rout them.
7 Reach down your hand from on high; deliver me and rescue me from the mighty waters, from the hands of foreigners
8 whose mouths are full of lies, whose right hands are deceitful.
9 I will sing a new song to you, my God; on the ten-stringed lyre I will make music to you,
10 to the One who gives victory to kings, who delivers his servant David. From the deadly sword
11 deliver me; rescue me from the hands of foreigners whose mouths are full of lies, whose right hands are deceitful.
12 Then our sons in their youth will be like well-nurtured plants, and our daughters will be like pillars carved to adorn a palace.
13 Our barns will be filled with every kind of provision. Our sheep will increase by thousands, by tens of thousands in our fields;
14 our oxen will draw heavy loads.There will be no breaching of walls, no going into captivity, no cry of distress in our streets.
15 Blessed is the people of whom this is true; blessed is the people whose God is the LORD.
Quran 2:190:
You may fight in the cause of GOD against those who attack you but do not aggress. GOD does not love the aggressors.