Huh? Humans are naturally social animals - our ability to live together (generally) peacefully predates religion.
Evolutionary cooperation is a thing - we have always survived by living in groups.
Cooperation, trust and empathy were always crucial survival skills allowing for things like hunting together, raising children and sharing resources. Groups where people murdered/ attacked/ stole from each other wouldn’t last long…
Also, studies on babies and even primates show that basic moral instincts like fairness, empathy, and helping others are wired into us biologically, not taught by religion. Unless chimps are Christian and we don’t realise!
As societies grew, they developed laws to manage behavior. These aren’t plucked from religion alone, they’re based on what works to keep a group stable and prevent absolute chaos. That’s another reason why the general ‘rules’ are the same across the globe, not just in Christian countries.
Religions like christianity absolutely helped codify these social ‘rules’ ("don’t murder," "don’t steal” etc.) but those rules existed because they were necessary for humans to successfully function as a society.