morality can be objective. it derives from the common goals a society shares. here's a hypothetical: say a tribe wants to build a bridge across a river to trade with another tribe. it's a big bridge that will require everyone working together for multiple generations. from this goal rules about behavior come into existence to maintain the course of reaching the goal. rules like don't kill your neighbor. the tribe communally agrees this is bad behavior because if you kill your neighbor, that's one less worker to contribute to the project and this limits everyone reaching the goal. they also come to an agreement not to fuck your neighbor's wife because it destabilizes your neighbors home and causes your neighbor to leave his village. maybe he kills his wife and children because of it. the end result is the tribe lost workers to contribute to the goal and the whole village suffers because of it. but the tribe decides stealing your neighbor's tools is ok. the tools are being used for the same purpose regardless of whose using them and your neighbor can just take someone else's tools to work. the end goal is still being accomplished so everyone agrees that's ok. you see how the tribe is objectively proving what is right and wrong?  our society is more complicated than this scenario and the morality we have established is the best course of action for what we are trying to communally achieve. life, peace, prosperity, safety, happiness and fulfillment. this is what religion has sorted out over many generations and lead to the various moral tenants of right and wrong. good and evil.
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