For example Christianity says "Be good to your neighbor" which is good seeing has their were disagreements and arguments between men in pre-biblical times.
Um...that's just requoting preexisting ideals, and religion hasn't solved that dilemma, either. There are disagreements, arguments, and misunderstandings all over the place. To quote another stereotype:

"Hey, neighbor, I need my leaf blower back."
"What leaf blower?"
"The one I lent you a couple months ago"
"I'm sorry, but I don't have it."
"Oh, I'm sure it's in your garage. I'll go have a look"
"HEY! I said I don't have it. Mind your own business."
"Hey! That's my leaf blower!"

Enter family feud. When you boil it down, religion really hasn't helped morality at all. All it has done is create the fictional punishment mechanism of hell, which doesn't work on the majority of people anyway.