Most people are set in their opinions and you can generally tell if you are able to sway them. If you aren't, it isn't worth the time. Most likely, though, if you can't agree on most stuff like religion, politics and baseball (money? No, fuck it, baseball) then you don't have a ton in common and things will eventually go down the crapper.
That being said, many people can still make it work, but not by fighting and trying to steamroll each other.
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