1 John 3:15: Anyone who hates his brother is a murderer, and you know that no murderer has eternal life in him.
It's pretty hard to go to war with someone if you don't hate them.
I'm glad a lot of people out there don't stay true to the word of the Bible. I for one have probably at some point made a 'your mom' joke.
In Matthew 15:4 "God says, 'Honor your father and mother,' and 'Anyone who speaks disrespectfully of father or mother must be put to death.'".
Many might (and do) argue that the silence of the New Testament on the subject of war apparently rests on the assumption that the subject had been adequately treated and did not call for any addition or modification. You certainly cannot argue that the old testament takes great revelry in war and God directly orders numerous atrocities that nowadays would be considered the worst kind of war crimes.
Modern Christianity seems to be about picking and choosing which parts of the books support their own personal belief system or political agenda. You display this yourself by referencing only the New Testament. It's just that other people select different parts such as the gay haters or the pro-life terrorists.